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【題目】 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：這些天空氣污染正變得越來越嚴重，這讓公眾擔憂。本句用it作形式主語，真正的主語是that air pollution is becoming more and more serious these days，故選A。

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