题目内容

Cindy shut the door heavily and burst into tears. No one in the office knew ______ she was so angry.( )

A. where     B. whether     C. that       D. why    

 

D

 

该空引导宾语从句,根据句意“办公室中没人知道她为什么如此生气”可判断选D项。

 

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