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【题目】Helen ran out of the classroom in tears, but no one knew ______ she was so sad

A. when B. whether

C. that D. why

【答案】D

【解析】分析句子,可知这是一个宾语从句,本题考查的是从属连词的用法,根据句意,可知选D。句意:海伦流着泪冲出了教室,但没人自导她为什么如此地伤心。

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