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虚拟语气:______,surely I would never have believed

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虚拟语气:______,surely I would never have believed
______,surely I would never have believed .
A.If I didn’t see B.Have I not see C.Had I not seen D.If I haven’t see
这句话是从哪里看出来要用虚拟语气的呀,为什么不能是A
C
这句话补全是
If i had not seen,surely I would never have believed
表示对过去的假设
if 从句 过去完成时,主句 would/should +have + 过去分词