It is uncertain side effect the medicine will bring about.although about two thousand patients have taken it. A. that B. what C. how D. whether 题目和参考答案——青夏教育精英家教网—

题目内容

It is uncertain________side effect the medicine will bring about，although about two thousand patients have taken it.

A. that

B. what

C. how

D. whether

B解析：句意：尽管大约有两千名病人已经服用了这种药物，但是它会产生什么样的副作用现在还不能确定。根据句意可知应该选择B项引导主语从句。what在这里实际上是作为形容词来修饰后面的“side effect副作用”。一起作从句中bring about的宾语。

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