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-----I _____without your help. I do appreciate it .
-----You are welcome.

A.can’t manageB.couldn’t manage
C.can’t have managedD.couldn’t have managed

D

解析试题分析:句意:没有你的帮忙我本不可能做到。我确实很感激。--不用谢。根据句意是虚拟语气“过去本不可能做而做了” couldn’t have done,A和B是说明的现在的情况,can’t have done不是虚拟语气而且对过去的推测“过去不可能做…”,选D。
考点:考查情态动词表示虚拟语气

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