In my opinion, the key air pollution is to inspire people to take public transport in big cities.A.

查询谷 - www.chaxungu.com

编辑：chaxungu时间：2026-04-27 03:09:23分类：高中英语题库

【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

在线课程

【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。