题目内容
3.We _________ to the airport,but why did you call a taxi?( )A. | should walk | B. | might walk | ||
C. | could have walked | D. | must have walked |
分析 我们本可以步行去机场的,你为什么要叫出租车?
解答 答案:C 句意表达的是与事实相反的假设,要用虚拟;对过去事实的相反假设,要用情态动词加完成时态来构成;must have done表示对过去的推测,不符合句意.故选C.
点评 虚拟语气是表示与事实相反的假设,构成方式有:对现在或将来,条件句中用一般过去时态,主语用情态动词加动词原形;对过去,条件句中用过去完成时态,主语用情态动词加完成时态.学习时,要牢记构成方式.

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