Unit 1 A new start 单元习题（含解析）

中小学教育资源及组卷应用平台
Lesson
One:(必修一)
句子成分分析练习
主语：将以下句子的主语部分划线
??????
During
the
1990s,
American
country
music
has
become
more
and
more
popular.
??????
We
often
speak
English
in
class.
??????
One-third
of
the
students
in
this
class
are
girls.
??????
To
swim
in
the
river
is
a
great
pleasure.
??????
Smoking
does
harm
to
the
health.
??????
The
rich
should
help
the
poor.
??????
When
we
are
going
to
have
an
English
test
has
not
been
decided.
??????
It
is
necessary
to
master
a
foreign
language.
谓语：将以下句子的谓语动词部分划线
The
bike
went
wrong
again.
Most
of
the
my
classmates
work
hard.
They
told
me
his
experiences
in
America.
Some
students
are
making
much
noise
in
the
classroom
now.
We
will
stay
at
the
school
at
the
weekend.
Many
flowers
will
have
been
planted
by
the
end
of
the
year.
The
old
lady
keeps
healthy
by
taking
exercise
every
day.
Our
old
books
have
been
sold
out
already.
Does
he
go
to
work
at
eight
?
Are
you
watching
football
games
now?
You
shall
be
bought
a
new
MP4
player
next
month.
表语：将以下句子的表语部分划线
??????
Our
teacher
of
English
is
an
American.
??????
Is
it
yours?
??????
The
weather
has
turned
cold.
??????
The
speech
is
exciting.
??????
Three
times
seven
is
twenty
one?
??????
His
job
is
to
teach
English.
??????
His
hobby（爱好）is
playing
football.
??????
The
machine
must
be
out
of
order.
??????
Time
is
up.
The
class
is
over.
??????
The
truth
is
that
he
has
never
been
abroad.
宾语：将以下句子的宾语部分划线
??????
They
went
to
see
an
exhibition（展览）yesterday.
??????
The
heavy
rain
prevented
me
from
coming
to
school
on
time.
??????
How
many
dictionaries
do
you
have?
I
have
five.
??????
They
helped
the
old
with
their
housework
yesterday.
??????
He
pretended
not
to
see
me.
??????
I
enjoy
listening
to
popular
music.
??????
I
think（that）he
is
fit
for
his
office.
宾语补足语：将以下句子的宾语补足语部分划线
They
painted
their
boat
white.
Let
the
fresh
air
in.
You
mustn’t
force
him
to
lend
his
money
to
you.
We
saw
her
entering
the
room.
We
found
everything
in
the
lab
in
good
order.
We
will
soon
make
our
city
what
your
city
is
now.
He
found
his
new
job
boring.
The
called
their
daughter
Mary.
This
placed
her
in
a
very
difficult
position.
We
went
to
here
house
but
found
her
out.
What
do
you
advise
me
to
do？
定语：将以下句子的定语部分划线
??????
Guilin
is
a
beautiful
city.
??????
China
is
a
developing
country;
America
is
a
developed
country.
??????
There
are
thirty
women
teachers
is
our
school.
??????
His
rapid
progress
in
English
made
us
surprised.
??????
Our
monitor
is
always
the
first
to
enter
the
classroom.
??????
The
teaching
plan
for
next
term
has
been
worked
out.
??????
He
is
reading
an
article
about
how
to
learn
English.
状语：将以下句子的状语部分划线
??????
Light
travels
most
quickly.
??????
He
has
lived
in
the
city
for
ten
years.
??????
He
is
proud
to
have
passed
the
national
college
entrance
examination.
??????
He
is
in
the
room
making
a
model
plane.
??????
Wait
a
minute.
??????
Once
you
begin,
you
must
continue.
??????
How
about
meeting
again
at
six?
??????
Last
night
she
didn’t
go
to
the
dance
party
because
of
the
rain.
??????
I
shall
go
there
if
it
doesn’t
rain.
??????
Mr
Smith
lives
on
the
third
floor.
??????
She
put
the
eggs
into
the
basket
with
great
care.
??????
She
came
in
with
a
dictionary
in
her
hand.
??????
In
order
to
catch
up
with
the
others,
I
must
work
harder.
??????
He
was
so
tired
that
he
fell
asleep
immediately.
??????
She
works
very
hard
though
she
is
old.
??????
I
am
taller
than
he
is.
时间状语从句：（难点分析一）
I
________________(have)
a
rest
on
the
sofa
when
the
telephone
rang．
2.While
we
______________(chat)when
she
came
in．
3.The
plane_______
just_________(take)
off
when
I
got
to
the
airport,
4.I
________(drive)down
to
London
when
I
suddenly
found
that
I
was
on
the
wrong
road.
5.
Tom
_______________(close)
the
window
when
his
attention
was
caught
by
a
bird.
6.I
was
about
to
say
when
you__________(interrupt)
me.
7.She_______________(go)out
when
the
telephone
rang.
8.We___________(have)
a
meeting
when
someone
broke
in.
9.She
was
on
the
point
of
watching
TV
when
there_____(be)
a
power
failure.
10.I
____just________(go)
to
bed
when
the
telephone
rang.
感叹句：（难点分析二）
1.---
_______
expensive
mobile
phone
it
is！
---Yes,
but
I
think
_______
style
is
quite
fashionable.
A.What
a；a
B.How；the
C.What
an;
the
D.How
an;
the
2.-.___________nice
the
ice
cream
looks!
I
can't
wait
to
taste
it.
A.
How
a
B.
How
C.
What
a
D.
What
3.---
The
six
students
from
Lianyungang
got
the
first
prize
in
the
Chinese
Characters
Dictation
Com?petition
in
Jiangsu.
---
exciting
news
it
is!
A.
What
B.
How
C.
What
an
D.
How
an
4.
---What
programme
is
so
attractive?
---The
guard
of
honor(仪仗队）of
the
PLA
are
taking
part
in
the
parade
on
Red
Square.
______exciting
event!
A.
How
a
B.
What
an
C.
How
an
D.
What
a
5.
---
_____
heavy
the
rainstorm
is!
---Yes,
the
town
has
experienced
the
most
serious
flood
during
the
past
ten
years.
A.
How
B.
What
C.
How
a
D.
What
a
6.?
---You?can'?t?imagine?________?great?fun?chatting?online?is!
---Really?But?it?may?cause?you?a?lot?of?trouble.?
A.what????
B.how????
C.why????
D.whether
7.---__________
weather
it
is!
We
can't
go
boating
on
the
Xuanwu
Lake.
---Don't
worry.
Let's
go
to
the
Science
Museum
instead.
A.
What
good
B.
How
good
C.
How
bad
D.
What
bad
8.
---
____
brave
Zhang
Hua
is!
---Yes.
He
helped
his
neighbour,
Mrs.
Sun
out
of
the
fire.
A.
What
a
B.
How
C.
How
a
D.What
9.
---Look!
That
teacher
is
explaining
something
to
her
students
again
and
again!
---_______teacher
she
is!
A.
How
patient
B.
What
patient
C.
How
a
patient
D.
What
a
patient
10.
---The
advantages
of
the
Chongqi
Bridge
have
already
been
seen.
---
________
good
news
to
us!
A.
What
B.
What
a
C.
How
D.
How
a
现在分词做状语（难点分析三）
?1.
It
rained
heavily
in
the
south，________
serious
flooding
in
several
provinces.
A.
caused??
B.
having
caused?
C.
causing??
D.
to
cause
2.
________?at
my
classmates'
faces,
I
read
the
same
excitement
in
their
eyes.
A.
Looking?????
B.
Look???
C.
To
look???
D.
Looked
3.
Lots
of
rescue
workers
were
working
around
the
clock,
______supplies
to
Yushu,
Qinghai
province
after
the
earthquake.
A.
sending????????
B.
to
send???????
????C.
having
sent?????
D.
to
have
sent
4.
He
had
a
wonderful
childhood，
_______with
his
mother
to
all
corners
of
the
world.
A.
travel?
B.to
travel.???
C.
traveled?????
D.
traveling
5.
Dina,
________?for
months
to
find
a
job
as
a
waitress,
finally
took
a
position
at
a
local
advertising
agency.
A.
struggling??????
???
B.
struggled??????C.
having
struggled?
???
D.
to
struggle?
6.
The
lawyer
listened
with
full
attention，________
to
miss
any
point．A．not
trying???????
B．trying
not?????
C．to
try
not????????
D．not
to
try
7.
The
news
shocked
the
public,
_______to
great
concern
about
students’
safety
at
school.
A.
having
led
B.
led
C.
leading??
D.
to
lead
8.
_______
from
heart
trouble
for
years,
Professor
White
has
to
take
some
medicine
with
him
wherever
he
goes.
A.
Suffered
B.
Suffering
C.
Having
suffered
D.
Being
suffered
9.
Finding
her
car
stolen,
_______.
A.
a
policeman
was
asked
to
help
B.
the
area
was
searched
thoroughly
C.
it
was
looked
for
everywhere
D.
she
hurried
to
a
policeman
for
help
10.
He
sent
me
an
e-mail,
________
to
get
further
information.
A.
hoped
B.
hoping
C.
to
hope
D.
hope
11.
While
building
a
tunnel
through
the
mountain,
_______.
A.
an
underground
lake
was
discovered
B.
there
was
an
underground
lake
discovered
C.
a
lake
was
discovered
underground
D.
the
workers
discovered
an
underground
lake
12.
Suddenly,
a
tall
man
driving
a
golden
carriage
________
the
girl
and
took
her
away,
________
into
the
woods.
A.
seizing;
disappeared
B.
seized;
disappeared
C.
seizing;
disappearing
D.
seized;
disappearing
13.
_______
in
the
queue
for
half
an
hour,
Tom
suddenly
realized
that
he
had
left
his
wallet
at
home.
A.
To
wait
B.
Have
waited
C.
Having
waited
D.
To
have
waited
14.
European
football
is
played
in
80
countries,
______
it
the
most
popular
sport
in
the
world.
A.
making
B.
makes
C.
made
D.
to
make
15.
Though
_______
money,
his
parents
managed
to
send
him
to
university.
A.
lacked
B.
lacking
of
C.
lacking
D.
lacked
in
情态动词表推测（难点分析四）
一、单项选择情态动词
1．If
we
had
paid
enough
attention
to
the
issue
of
the
heavily-overloaded
vehicles,
the
tragedy
of
the
collapse
of
an
overpass
in
Wuxi
_____
avoided.
A．should
B．could
be
C．should
have
been
D．could
have
been
2．---
Oh,
my
God!
I
just
missed
the
last
bus
back
home.
---
That’s
really
bad.
I’m
sure
you
______
it,
but
you
just
didn’t
hurry
up.
A．had
caught
B．could
have
caught
C．could
catch
D．can
catch
3．Ann
said
whenever
her
father
was
unhappy
he
________
go
out
and
buy
something,
usually
something
large
and
useless.
A．should
B．could
C．would
D．might
4．It
is
really
cold
and
the
ground
is
wet;
it
________
have
rained
last
night.
A．might
B．must
C．can
D．should
5．---Hi,
Johnson,
any
idea
where
Susan
is?
---It
is
class
time,
so
she
__________
in
the
classroom
now.
A．can
be
B．must
have
been
C．might
have
been
D．should
be
6．
The
law
is
equally
applied
to
everyone.
No
one
_______
be
above
it.
A．shall
B．must
C．may
D．need
7．I
love
the
weekend,
because
I
________
get
up
early
on
Saturdays
and
Sundays.
A．mustn’t
B．needn’t
C．wouldn’t
D．shouldn’t
8．The
weather
turned
out
to
be
fine.
I
_____________
the
trouble
to
carry
the
umbrella
with
me.
A．should
have
taken
B．must
have
taken
C．couldn't
have
taken
D．needn't
have
taken
9．The
new
supermarket
has
announced
that
the
first
to
purchase
goods
on
the
opening
day
________
get
a
big
prize.
A．must
B．could
C．would
D．shall
10．—Tony
_______
what
I
did
annoying
though
he
didn’t
say
anything.
—So
you
think
you
will
have
to
make
an
apology?
A．could
find
B．should
have
found
C．might
find
D．must
have
found
11．Students
____
remain
in
their
seats
until
all
the
papers
have
been
collected
according
to
the
regulation.
A．would
B．shall
C．will
D．could
12．---
Difficulties
always
go
with
me!
---
Cheer
up!
If
God
closes
door
in
front
of
you,
there
be
a
window
opened
for
you.
A．must
B．would
C．could
D．can
13．Using
AI，
many
companies
are
now
conducting
experiments
that__________
possible
just
a
few
years
ago．
A．would
have
been
B．might
have
been
C．shouldn't
have
been
D．couldn't
have
been
14．Mr.
Smith
is
almost
on
time
for
everything.
How
________
it
be
that
he
was
late
for
the
meeting?
A．can
B．should
C．may
D．must
15．(2018·天津)
I
can't
find
my
purse.
I___________
it
in
the
supermarket
yesterday,
but
I'm
not
sure.
A．should
leave
B．must
have
left
C．might
leave
D．could
have
left
16．The
principal
in
our
school
has
recently
passed
a
rule
that
students
_______
wear
school
uniforms
in
our
campus.
A．may
B．should
C．will
D．shall
17．You
_____
be
right
but
I’m
going
back
to
check
anyway.
A．should
B．must
C．need
D．might
18．You
________
be
Carol.
You
haven’t
changed
a
bit
after
all
these
years.
A．must
B．can
C．will
D．shall
19．Peter
searched
all
the
places
where
he________have
left
her
iPad
but
it
was
all
in
vain.
A．might
B．would
C．must
D．should
201．According
to
the
latest
rule,
people
_______sort
household
garbage
into
four
categories.
A．can
B．shall
C．may
D．need
答案：
主语：
??????
During
the
1990s,
American
country
music
has
become
more
and
more
popular.（名词）
??????
We
often
speak
English
in
class.（代词）
??????
One-third
of
the
students
in
this
class
are
girls.（数词）
??????
To
swim
in
the
river
is
a
great
pleasure.（不定式）
??????
Smoking
does
harm
to
the
health.（动名词）
??????
The
rich
should
help
the
poor.（名词化的形容词）
??????
When
we
are
going
to
have
an
English
test
has
not
been
decided.（主语从句）
??????
It
is
necessary
to
master
a
foreign
language.（it作形式主语，真正的主语为后面的不定式）
谓语：将以下句子的谓语动词部分划线
The
bike
went
wrong
again.(went
作谓语，系动词)
Most
of
the
my
classmates
work
hard.（work作谓语，不及物动词）
They
told
me
his
experiences
in
America.（told作谓语，及物动词）
Some
students
are
making
much
noise
in
the
classroom
now.(are
making作谓语)
We
will
stay
at
the
school
at
the
weekend.(will
stay作谓语)
Many
flowers
will
have
been
planted
by
the
end
of
the
year.（will
have
been
planted作谓语）
The
old
lady
keeps
healthy
by
taking
exercise
every
day.
Our
old
books
have
been
sold
out
already.
Does
he
go
to
work
at
eight
?
Are
you
watching
football
games
now?
You
shall
be
bought
a
new
MP4
player
next
month.
表语：
??????
Our
teacher
of
English
is
an
American.（名词）
??????
Is
it
yours?（代词）
??????
The
weather
has
turned
cold.（形容词）
??????
The
speech
is
exciting.（分词）
??????
Three
times
seven
is
twenty
one?（数词）
??????
His
job
is
to
teach
English.（不定式）
??????
His
hobby（爱好）is
playing
football.（动名词）
??????
The
machine
must
be
out
of
order.（介词短语）
??????
Time
is
up.
The
class
is
over.（副词）
??????
The
truth
is
that
he
has
never
been
abroad.（表语从句）
宾语：：
??????
They
went
to
see
an
exhibition（展览）yesterday.（名词）
??????
The
heavy
rain
prevented
me
from
coming
to
school
on
time.（代词）
??????
How
many
dictionaries
do
you
have?
I
have
five.（数词）
??????
They
helped
the
old
with
their
housework
yesterday.（名词化形容词）
??????
He
pretended
not
to
see
me.（不定式短语）
??????
I
enjoy
listening
to
popular
music.（动名词短语）
??????
I
think（that）he
is
fit
for
his
office.（宾语从句）
宾语补足语：
They
painted
their
boat
white.（形容词）
Let
the
fresh
air
in.（副词）
You
mustn’t
force
him
to
lend
his
money
to
you.（不定式短语）
We
saw
her
entering
the
room.（现在分词）
We
found
everything
in
the
lab
in
good
order.（介词短语）
We
will
soon
make
our
city
what
your
city
is
now.（从句）
He
found
his
new
job
boring.
(形容词作宾补)
The
called
their
daughter
Mary.
(名词作宾补)
This
placed
her
in
a
very
difficult
position.
(介词短语作宾补)
We
went
to
here
house
but
found
her
out.
(副词作宾补)
What
do
you
advise
me
to
do？(不定式作宾补)
定语：
??????
Guilin
is
a
beautiful
city.（形容词）
??????
China
is
a
developing
country;
America
is
a
developed
country.（分词）
??????
There
are
thirty
women
teachers
is
our
school.（名词）
??????
His
rapid
progress
in
English
made
us
surprised.（代词）
??????
Our
monitor
is
always
the
first
to
enter
the
classroom.（不定式短语）
??????
The
teaching
plan
for
next
term
has
been
worked
out.（动名词）
??????
He
is
reading
an
article
about
how
to
learn
English.（介词短语）
状语：
??????
Light
travels
most
quickly.（副词及副词性词组）
??????
He
has
lived
in
the
city
for
ten
years.（介词短语）
??????
He
is
proud
to
have
passed
the
national
college
entrance
examination.（不定式短语）
??????
He
is
in
the
room
making
a
model
plane.（分词短语）
??????
Wait
a
minute.（名词）
??????
Once
you
begin,
you
must
continue.（状语从句）
??????
How
about
meeting
again
at
six?（时间状语）
??????
Last
night
she
didn’t
go
to
the
dance
party
because
of
the
rain.（原因状语）
??????
I
shall
go
there
if
it
doesn’t
rain.（条件状语）
??????
Mr
Smith
lives
on
the
third
floor.（地点状语）
??????
She
put
the
eggs
into
the
basket
with
great
care.（方式状语）
??????
She
came
in
with
a
dictionary
in
her
hand.（伴随状语）
??????
In
order
to
catch
up
with
the
others,
I
must
work
harder.（目的状语）
??????
He
was
so
tired
that
he
fell
asleep
immediately.（结果状语）
??????
She
works
very
hard
though
she
is
old.（让步状语）
??????
I
am
taller
than
he
is.（比较状语）
时间状语从句：
I.was
having
2.were
chatting
3.had__taken_
4.was
driving_
5.
was
about
to
close
6.interrupted
7.was
about
to
go
8.were
having
9.was
10.had__gone
感叹句：
C
B
A
B
A
A
D
B
D
A
现在分词作状语：
1-5
CAADC
6-10
BCCDB
11-15
DDCAC
情态动词表推测（难点分析四）
1．【答案】D
【详解】
考查情态动词用法。句意：如果我们对超载车辆问题给予足够的重视，就可以避免无锡立交桥垮塌的悲剧。本句为“情态动词+have
done”结构，结合句意表示“本来可以；本来能够”应用could
have
done结构，且主语与谓语动词avoid构成被动关系，故应用be
done形式。故选D。
2．【答案】B
【详解】
考查情态动词+have
done结构。句意：——哦,我的上帝!我刚好错过了回家的末班车。——这是非常糟糕的。我肯定你能赶上，但你就是不抓紧。could
have
done“本来能做而没有做”。故选B。
3【答案】C
【详解】
考查情态动词。句意：安说无论什么时候她父亲不高兴的时候，他就会出去买些东西，通常是一些又大又没用的东西。A.
should应该；B.
could能；C.
would总是，愿意；D.
might可能。此处表示过去经常习惯做某事，故选C。
4．【答案】B
【详解】
考查情态动词辨析。句意：天气很冷而且地面是湿的，昨晚一定下了雨。根据上文the
ground
is
wet可知，“昨晚下了雨”是肯定的，故用must
have
done“必定做了……”表示对过去十分有把握的推测，故选B。
5．【答案】D
【解析】
考查情态动词的用法。A.
can
be可能，可以是；B.
must
have
been一定（对过去事实肯定的推测）；C.
might
have
been可能（对过去事实肯定的推测）；D.
should
be应该是。句意：—知道苏珊在哪里吗？—现在是上课时间，她应该在教室里。故答案选D。
6．【答案】A
【详解】
考查情态动词。句意：法律面前人人平等。没有人能凌驾于法律之上。A.
shall用于第二、第三人称，则含有命令、警告、允诺或威胁的语气。B.
must（必须，一定）用于肯定句。C.
may（可以，能够）表允许时一般不与第三人称连用。D.
need
(表示没有必要或询问是否有必要)
需要；故选A。
7．【答案】B
【详解】
考查情态动词。句意：我喜欢周末，因为周六周日不必早起。A.
mustn’t不能，禁止；B.
needn’t不必；C.
wouldn’t不会；D.
shouldn’t不应该。此处表示“不必”，故B项正确。
8.【答案】D
【详解】
考查情态动词
+
have
done。句意：天气转晴了。我本不必费心把伞带在身边。A.
should
have
taken本应该做某事，而实际上没做；
B.
must
have
taken对过去发生的事情的肯定猜测；C.
couldn't
have
taken不可能；D.
needn't
have
taken本来不需要，故选D。
9.【答案】D
【详解】
考查情态动词的用法。句意：新开业的超市宣布，开业当天首先购物的人会得到大奖。shall
用于二三人称的陈述句中可以表示说话人的承诺，命令，警告等，此处表示超市的承诺，故选D。
10.【答案】D
【详解】
考查情态动词+have
done。句意：—Tony一定觉得我做的事很烦人，尽管他什么也没说。—所以你认为你得道歉吗?。由“what
I
did”可知，此处是对过去事情有把握的推测，must
have
done“一定是做某事了”。故选D项。
11.【答案】B
【详解】
考查情态动词。句意：学生们必须呆在自己的座位上，直到所有的试卷都被收回。根据句意，“学生们呆在自己的座位上”是一项规定。shall
可表示某种规定或义务，用于第二、三人称的句子中。而其他情态动词无此用法。故正确答案为B。
12.【答案】A
【详解】
考查情态动词辨析。句意：——困难总是伴随着我！——高兴点!
如果上帝在你面前关上了门，一定有一扇窗户为你打开。A.
must必须；B.
would将要；C.
could能，会；D.
can能，会。must表示对现在的状态推测时，意为“一定”，表示可能性很大的推测。符合语境。故选A。
13.【答案】D
14.【答案】A
【详解】
考查情态动词辨析。句意：史密斯先生几乎任何事情都是准时的。他怎么可能开会迟到了？
A.
can可能，可能性，表示可能性时，常用于否定句和疑问句中，且有时还带有“惊奇、不相信”
等感彩。B.
should
应该；
C.
may也许，表示可能性时常用于肯定句中，不用于疑问句中。D.must常用于肯定句中表推测，“一定……”的意思；本题是强调句型的一个变式：强调其特殊疑问句how的形式。根据前句“斯密斯先生几乎是很准时”可推测出“怎么可能开会迟到呢？”。根据句意可知，用于疑问句中的“可能性”且有不相信的色彩，四个选项只有“can”符合题意。故选A
15.【答案】D
【详解】
考查情态动词表推测。句意：我不能找到我的钱包了，昨天我有可能把它落到超市了，但我不确定。根据句中时间状语yesterday可知，是对过去事情的推测，故用情态动词+
have
done，再根据后句but
I’m
not
sure.可知，此推测为不能肯定的推测，故用情态动词could，表示“可能”。故选D。
16.【答案】D
【详解】
考查情态动词。句意：我们学校的校长最近通过了一项规定，要求学生在校园里穿校服。分析句子可知，“that
students
_______
wear
school
uniforms
in
our
campus.”是同位语从句对名词“rule”内容解释说明。当表示强制，用于法令、条约、规章中，意为“必须，应该”等时句子用情态动词shall。故选D。
17.【答案】D
【详解】
考查情态动词。句意：你或许是对的，但我还是要回去核对一下。A.
should应该；B.
must一定，必须；C.
need需要；D.
might或许。本题主要考查情态动词表示推测的用法，由I’m
going
back
to
check
anyway可知，我对此不确定。由此可知，D项符合题意。故选D项。
18.【答案】A
【详解】
考查情态动词。句意：你肯定是卡罗，这些年你一点也没有变化。must表示对现在的肯定推测；can表示推测，表示可能性；will表示意愿；shall表示表示决心、命令或指示。根据下文“这些年你一点用没有改变”可知，前文表示肯定性推测。故选A。
19.【答案】A
【详解】
考查情态动词辨析。句意：彼得找遍了所有他可能放她的iPad的地方，但都没有找到。A.
might可能；B.
would将会；C.
must必须，一定；D.
should应该。might
have
done表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。故选A。
20.【答案】B
【详解】
考查情态动词辨析。句意：根据最新的规定，人们应该把生活垃圾分成四类。A.
can能；B.
shall应该；C.
may也许；D.
need需要。shall用于第二人称表示承诺、命令、警告、威胁的口吻，这里是指法令规定了……，因此用shall。故选B。
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