◎ 题干
She looks sad. Could you please tell me      that prevents her from being as happy as before?
[     ]
A. what it is    
B. it is what    
C. how it is      
D. it is how
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“She looks sad. Could you please tell methat prevents her from being as happy as before?[ ]A. what it is B. it is whatC. how it is D. it is how…”主要考查了你对  【宾语从句】  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。