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In my opinion, the key ____air pollution...

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

 

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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