Unit 5 Theme parks Learning about language课时作业

第一节 单项选择

1. They were abroad during the months when we were carrying out the investigation, or they _____ to our help.

A. would have come B. could come

　　C. have come D. had come

【考点】考察虚拟语气

【答案】A

【解析】本句考察的是一个含蓄的虚拟条件句，句中的or相当于if they had not gone abroad.因为前面句中使用的是were，说明这个虚拟语气是与过去事实相反，所以主句中使用的是"情态动词+have done"的形式。句意：在我们进行这项调查的这几个月里，他们在国外，要不然，他们就会来帮助我们的。故A正确。

【举一反三】He have completed his work; or he wouldn't be enjoying himself by the seaside.

A.should B.must C.wouldn't D.can't

〖答案〗B

〖考点〗考查情态动词表猜测的用法。

〖解析〗由句意 "他一定是已经完成工作了；否则, 他就不会在海边玩得那么高兴。"可知是对过去发生事情的肯定推测。

2. I've ordered some pizza , so we _____ worry about cooking when we get home tired.

　　A.can't B. dare not c. needn't D. may mot

【考点】考察情态动词

【答案】C

【解析】本题考察的是情态动词意义辨析。Can't不可能；做不到；dare not不敢；needn't 不必；may not也许不；句意：我已经点了一些披萨，所以当我们很累地到家的使用，不必担心做饭的问题。Need既可以作为情态动词，也可以作为行为动词。当它作为情态动词的使用常常用于疑问句和否定句中，表示"不必"。根据句意说明C正确。