◎ 题干
—He looks unhappy.
—Yes, but he can't say what it is ______ is bothering him.
[     ]
A. as          
B. that            
C. what            
D. which
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—He looks unhappy.—Yes, but he can't say what it is ______ is bothering him.[ ]A. asB. that C. what D. which…”主要考查了你对  【连接代词】【主语从句】  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。