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    精英家教网 > 高中英语 > 题目详情
    It is uncertain ___ side effects these weight-loss drugs will bring about, although hundreds of thousands of patients have taken it.
    A．thatB．whetherC．howD．what
    D
    考查主语从句的连接词。本题的it是形式主语。真正的主语是后面的从句，因为side effects是名词短语，所以使用what进行强调。结合句意可知D正确。句意：尽管很多病人已经服用它了，但这种减肥药会有什么样的副作用还不确定。
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