I don’t know ____ or not he is right.

A．thatB．what
C．ifD．whether

D

解析試題分析：句意：我不知道他是否是對(duì)的。whether or not，是固定搭配，是否。結(jié)合句意，故選D
考點(diǎn)：考查連詞的用法。

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