Question

If it ________ for the snow, we ________ the mountain yesterday．

[　　]

A．

were not; could have climbed

B．

were not; could climb

C．

had not been; could have climbed

D．

had not been; could climb

Answer 1

答案：C
解析：

原题中的yesterday是信息词，可暗示该句应选与过去事实相反的虚拟语气条件与主句的动词形式。从句用过去完成时，而主句用could＋have＋过去分词。