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

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

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