【題目】I’m not sure ________ he is right or not.

A. if B. whether C. that D. Who

【答案】B

【解析】

試題分析：句意：我不能確定他是否是正確的。根據(jù)題意，本題考查賓語從句，但是if不常和or not連用，whether可以和or not連用。故選B。

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