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

【答案】

【解析】这题考查what引导名词性从句的用法，这里what引导主语从句，并在主语从句中what修饰side effect，句意是：虽然近4千名病人服用过这个药，但它会产生什么副作用还不确定。选B。

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