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3.We _________ to the airport,but why did you call a taxi?(  )
A.should walkB.might walk
C.could have walkedD.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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