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【题目】I dont know ______ you are right or not.

A.ifB.whetherC.whatD.who

【答案】B

【解析】

句意:我不知道你是否正确。

______ you are right or not.作宾语,是宾语从句,该句是主系表结构,不缺少主语或者宾语,故排除CD if whether都可以引导宾语从句,都意为“是否”,但是当和or not连用时经常用whether,故选B

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