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20.Why didn't you tell me there was no meeting today?I _____ all the way here through the heavy snow.(  )
A.needn't have drivenB.can't have driven
C.mustn't have drivenD.shouldn't have driven

分析 为什么你不告诉我今天不开会?那样我就不必冒着大雪开车来这了.

解答 答案:A 题干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;mustn't和can't不能用来构成虚拟;shouldn't本不应该,不符合句意.故选A.

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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