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It was so nice of you to come to our aid. I don’t think we ______ it without you.   

A.can manageB.could have managed C.must have managed D.could manage

B

解析试题分析:句意:你能来帮助我们真是太好了,我认为没有你我们不可能已经完成它。Could have done:可能已经做了某事 must have done:一定已经做了某事 根据句意可知表达一种对过去情况进行虚拟,故用could/would/might/should+have done。故选B。
考点:考查虚拟语气。

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