It is uncertain ________ side effect the medicine will bring about，although about two thousand patients have taken it．[ ]A．that B．whatC．how D．whether-高中英语-魔方格

◎ 题干

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

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◎ 解析

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◎ 知识点

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