Cindy shut the door heavily and burst into tears. No one in the office knew__...

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问题 Cindy shut the door heavily and burst into tears. No one in the office knew__________ shewas so angry.

选项 A.where
B.whether
C.that
D.why

答案D

解析根据句意Cindy把门重重地关上放声大哭。办公室里没有一个人知道她为什么(why引导宾语从句)这么生气。
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