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    精英家教网 > 初中英语 > 题目详情
    Nowadays scientists are working hard to find out ______ to do with air pollution.
    A．howB．whyC．whenD．what
    D

    试题分析：句意：现在科学家们正在努力找出做什么可以解决空气污染问题。how 怎么； why为什么； when何时； what什么。所以选D。
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