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    _______we are worried about is that air pollution is becoming much heavier in Han Dan.
    A．ItB．WhatC．WhyD．Which
    B

    试题分析：句意：我们担心的事情是邯郸的空气污染越来越严重。这里is前面是主语从句，而主语从句中缺少宾语，用what引导主语从句，it是做形式主语，why为什么，which哪个，都不符合句意。选B。
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