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18.Oh,My goodness!You are still working on the assignment.It __________two days ago.(  )
A.must have been handed inB.can't have been handed in
C.should have been handed inD.shouldn't be handed in

分析 哦,天啦!你还在做作业啊.两天前就应该交了.

解答 答案:C 题干表达的是与事实相反的假设,要用虚拟;句意表达的对过去的事实的相反假设,要用情态动词加完成时态来构成,表示本应该做而没有做到的事;must/can't不能用来构成虚拟.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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