◎ 题干
-I'm sorry , but I don't know the answer.
- _____ aren't you supposed to be an expert on this subject?
[     ]
A. Why not you
B. Why not
C. Why do you
D. Why don't you
◎ 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“-I'm sorry , but I don't know the answer.- _____aren't you supposed to be an expert on this subject?[ ]A. Why not youB. Why notC. Why do youD. Why don'…”主要考查了你对  【固定搭配】  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。