If it had not been for the snow, we ______ the mountain yesterday.

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问题 If it had not been for the snow, we ______ the mountain yesterday.

选项 A、can have climbed
B、could climb
C、can climb
D、could have climbed

答案D

解析原题中的yesterday是信息词可暗示考生，该句应选与过去事实相反的非真实条件句虚拟语气条件。从句用过去完成式，而主句用could + have+过去分词。答案为D。

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