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I would never have believed it was possible if I ______ it with my own eyes. A. didn'

题目

I would never have believed it was possible if I ______ it with my own eyes.

A. didn't see

B. don't see

C. won't see

D. hadn't seen

参考答案
正确答案:D
     8.这是一个条件句。与过去已发生的事实相反,主句用过去将来完成时,条件从句用过去完成时选项D 是正确的。