This is certainly the case, but ____ it is a mistake or not I don’t know.       A.

This is certainly the case, but ____ it is a mistake or not I don’t know.

      A. if              B. even though        C. whether       D. that

答案

C                        


解析:

引导宾语从句时,whether 和if常可互换,但如从句提前,则只能用whether。  

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