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3.But for their help,we ____ the program in time.(  )
A.can not finishB.will not finish
C.had not finishedD.could not have finished

分析 要不是他们帮忙,我们不可能及时完成这项计划.

解答 答案:D 题干表达与事实相反的假设,要用虚拟;对过去的虚拟,主句要用情态动词加完成时态来构成;句中but for相当于条件句if they hadn't helped us.故选D.

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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