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His work _____ have been completed; otherwise, he wouldn’t be enjoying himself on the beach.


  1. A.
    should
  2. B.
    shouldn’t
  3. C.
    can’t
  4. D.
    must
D
试题分析:考察情态动词用法。Should have done本应该做某事,实际上却未做;shouldn’t have done本不应该做某事,实际上却做了。Can’t have done不可能做了某事;must have done一定做了某事;本句的关键在于otherwise后面的句意。句意:他肯定完成了他的工作,要不然,他不会在海滩上玩得那么开心的。根据句意说明这是对过去发生的事情的有把握的肯定推测。故D正确。
考点:考察情态动词用法
点评:本题是高考必考考点,一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事;shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事;needn’t have done 本没有必要做某事;注意没有 mustn’t have done的形式。
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A.Humans didn’t explore the oceans until the 19th century.
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