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

試題分析：句意：我們擔心的事情是邯鄲的空氣污染越來越嚴重。這里is前面是主語從句，而主語從句中缺少賓語，用what引導主語從句，it是做形式主語，why為什么，which哪個，都不符合句意。選B。
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