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【题目】In my opinion, the key ____air pollution is to inspire people to take public transport in big cities.

A. reduced B. reducing C. to reduce D. to reducing

【答案】D

【解析】

考查固定结构。句意:在我看来,在大城市减少空气污染的关键是鼓励人们乘坐公共交通。the key to doing sth.“做某事的关键,故选D。

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