【題目】What worried her a bit is ______ her hair was turning grey.
A.whether
B.if
C.what
D.that

【答案】D
【解析】句意:讓她有點(diǎn)不安的是她的頭發(fā)漸漸變得花白。此處為表語從句,whether和if引導(dǎo)名詞性從句時(shí),意為“是否”,該句則句意不通;what引導(dǎo)名詞性從句時(shí),需要充當(dāng)句子的主語、表語或賓語;that引導(dǎo)名詞性從句時(shí),只起連接作用,沒有漢語意思。本句中的從句句子成分齊全,不缺成分,所以應(yīng)使用代詞that。故選D。

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