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【题目】 worries the public that air pollution is becoming more and more serious these days.

A. It B. That C. What D. This

【答案】A

【解析】考查it的用法。句意:这些天空气污染正变得越来越严重,这让公众担忧。本句用it作形式主语,真正的主语是that air pollution is becoming more and more serious these days,故选A。

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