we are worried about is that air pollution is becoming much heavier in Han Dan.A．ItB．WhatC．WhyD．Which 题目和参考答案——青夏教育精英家教网——

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

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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