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I have not found my book yet; in fact, I am not sure I could have done with it.

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I have not found my book yet; in fact, I am not sure I could have done with it.

I have not found my book yet; in fact, I am not sure ________ I could have done with it.

[]

A.whether

B.where

C.what

D.when

试题答案

答案:C