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The driver ____ have drunk a lot before the accident, but I'm not quite sure of that.
A.mightB.mustC.shouldD.would
A

试题分析:考察情态动词用法。Might have done也许做了某事;must have done一定做了某事;should have done本应该做某事,实际上却未做;would have done会做某事;句意:司机也许在事故之前喝酒了。但是我也我不确定。根据后半句我不确信,说明这是对过去情况的一种没有把握的推测。故A正确。
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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