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

答案：C
解析：

原題中的yesterday是信息詞，可暗示該句應選與過去事實相反的虛擬語氣條件與主句的動詞形式。從句用過去完成時，而主句用could＋have＋過去分詞。


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