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    精英家教网 > 高中英语 > 题目详情
    _____ we were worried about was _______ they could manage to control the pollution.
    A．That; howB．That; whether
    C．What; thatD．What; whether
    C

    这题考查名词性从句的用法,what引导的是主语从句，what在主语从句中做宾语，that引导表语从句，在从句中不做成分。句意是：我们担心的是,是否他们能设法控制祝污染。
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