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【题目】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:让她有点不安的是她的头发渐渐变得花白。此处为表语从句,whether和if引导名词性从句时,意为“是否”,该句则句意不通;what引导名词性从句时,需要充当句子的主语、表语或宾语;that引导名词性从句时,只起连接作用,没有汉语意思。本句中的从句句子成分齐全,不缺成分,所以应使用代词that。故选D。

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