The driver ____ have drunk a lot before the accident, but I"m not quite sure of

题型：不详难度：来源：

The driver ____ have drunk a lot before the accident, but I"m not quite sure of that．

A．might

B．must

C．should

D．would

答案

A

解析

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。