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

A.thatB.what

C.ifD.whether

【答案】D

【解析】

句意:我不知道他是否對(duì)。

考查從屬連詞(引導(dǎo)詞)。A. that作從屬連詞時(shí),無(wú)詞義,不作句子成分。B. what可作連接代詞,引導(dǎo)名詞性從句。C. if意為“是否”,引導(dǎo)名詞性從句;意為“如果”,引導(dǎo)條件狀語(yǔ)從句。D. whether意為“是否”,引導(dǎo)名詞性從句,可與or not連用。故選D。

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