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【题目】I don’t know ________ he is right or not.

A.thatB.what

C.ifD.whether

【答案】D

【解析】

句意:我不知道他是否对。

考查从属连词(引导词)。A. that作从属连词时,无词义,不作句子成分。B. what可作连接代词,引导名词性从句。C. if意为“是否”,引导名词性从句;意为“如果”,引导条件状语从句。D. whether意为“是否”,引导名词性从句,可与or not连用。故选D。

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