I don't know ____if he can't do it.A what B when C where D how

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I don't know ____if he can't do it.
A what B when C where D how

选A
what if 倘使...将会怎样,即使...又有什么要紧
本句的意思是:我不知道如果他做不了我将会怎样.

A
what if固定表达法.这句话的意思是“我不知道如果他不会做我该怎么办。”

D
如果他不会做，我也不知道该怎么做。

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