题目内容
_______we are worried about is that air pollution is becoming much heavier in Han Dan.
| A．It | B．What | C．Why | D．Which |
B
解析试题分析：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。
考点：考查主语从句
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