◎ 题干
It will be some years before some foreign doctors change the impression they have ____Chinese medicine, _____, in their opinion, is nothing but raw herbs and not effective at all in treating diseases.
[     ]
A. for; which  
B. on; what  
C. to; that  
D. on; which
◎ 答案
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◎ 解析
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◎ 知识点
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