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【高一英语】If it____for the snow,we____the mountain yesterday.

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【高一英语】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
A为什么不对呢?
C.had not been ;could have climbed
这是对过去的事实完全相反的假设,用的是完成式.
A的前后2个选项在时态上不配套.