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

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

选项 A、didn’t see
B、don’t see
C、won’t see
D、hadn’t seen

答案D

解析 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。
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