【題目】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，可知這是一個賓語從句，本題考查的是從屬連詞的用法，根據(jù)句意，可知選D。句意：海倫流著淚沖出了教室，但沒人自導(dǎo)她為什么如此地傷心。

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