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But for their help, we ______ the program in time.
A.can not finishB.will not finish
C.had not finishedD.could not have finished
D
考查虚拟语气。根据But for their help要不是他们的帮助;可知这是一个与过去事实相反的含蓄的虚拟语气句,后面主句应该使用情态动词+have done;句意:要不是他们的帮助,我们不能够及时完成这项计划。
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