_______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(dān)心的事情是邯鄲的空氣污染越來(lái)越嚴(yán)重。這里is前面是主語(yǔ)從句，而主語(yǔ)從句中缺少賓語(yǔ)，用what引導(dǎo)主語(yǔ)從句，it是做形式主語(yǔ)，why為什么，which哪個(gè)，都不符合句意。選B。
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