［典型例题探究］ 规律发现
1.A library with five thousand books ______to the nation as a gift.A.is offered B.has offeredC.are offered D.have offered解析：a library with...结构中，前面的名词作主语，故谓语动词为单数，同时本题表达的应为被动意思，故答案为A。答案：A2.When and where to build the new factory ______yet.A.is not decided B.are not decidedC.has not decided D.have not decided解析：when and where to build the new factory所指的是一件事，因此谓语动词要用单数。故选 A。答案：A3.Visitors ______not to touch the exhibits.A.will request B.is requestedC.are requesting D.are requested解析：根据句意得知，参观者应当是“被要求”，只有D项符合。答案：D4.The Olympic Games，______in 776 B.C.，didn’t include women players until 1912.A.first playingB.to be first playedC.first playedD.to be first playing解析：因play“进行体育运动”是及物动词，与the Olympic Games是被动关系，又因不是句子的谓语，空格处只能用非谓语动词形式，过去分词作状语说明动作已经结束，故应选择C。答案：C 英语中经常出现主语后跟介词短语的情况，如：as well as，but，together with等，做题时予以注意。不定式、动名词、从句作主语时谓语动词为单数。因为说的是同一件事。但如果不是同一件事，则用复数。例如：What he said and what he did are different.他说的和他做的不同。通过语境来判断被动语态，再结合主语来判断单复数，即可找到答案。做此类题目，注意主语与动词的关系，如为动宾关系则用被动，反之为主动。
