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

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

【答案】B

【解析】

试题分析:句意:我不能确定他是否是正确的。根据题意,本题考查宾语从句,但是if不和or not连用,whether可以和or not连用。故选B。

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