【題目】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】

考查固定結(jié)構(gòu)。句意：在我看來，在大城市減少空氣污染的關(guān)鍵是鼓勵人們乘坐公共交通。the key to doing sth.“做某事的關(guān)鍵”，故選D。

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