(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research
题型：不详难度：来源：
(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.| A．can | B．must | | C．would | D．need |
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答案
| B |
解析
| 选B。分析主从句逻辑关系，主句是对从句表达的原因的一种猜测，must have done想必/准是/一定做过某事，符合主从句之间的逻辑关系。本题句意为“既然没人给他帮忙，那他肯定是自己做的研究”。can have done 用于疑问句或否定句中，表示对过去情况的推测；would have done表示过去将来完成时或用于虚拟语气中；need have done 通常用于否定句和疑问句中，表示“本不必做某事却做了”。 |
举一反三
(2013·高考北京卷)—You needn’ t take an umbrella.It isn’t going to rain.
—Well，I don’t know.It________do.| A．might | B．need | | C．would | D．should |
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(2013·高考天津卷)No one ________be more generous; he has a heart of gold.| A．could | B．must | | C．dare | D．need |
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(2013·高考重庆卷)—What are you doing this Saturday?
—I’m not sure，but I________go to the Rolling Stones concert.| A．must | B．would | | C．should | D．might |
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(2013·高考辽宁卷)Harry is feeling uncomfortable.He ________too much at the party last night.| A．could drink | B．should drink | | C．would have drunk | D．must have drunk |
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(2013·高考四川卷)—Why are your eyes so red? You________have slept well last night.
—Yeah，I stayed up late writing a report.| A．can’t | B．mustn’t | | C．needn’t | D．won’t |
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