◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Cindy shut the doorheavily and burst into tears. No one in the office knew _____ she was so angry.[ ]A. where B. whetherC. thatD. why…”主要考查了你对  【连接副词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。