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下面A、B、C、D选项中各有一处错误,选出错误并改正

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下面A、B、C、D选项中各有一处错误,选出错误并改正
By planting trees,we can help keep the air clean and make a contribution to reduce pollution .
A是By B是keep C是make D是reduce
下面A、B、C、D选项中各有一处错误,选出错误并改正
B是没错的,help to do sth里面的to是可以省略的.
D是错的,make a contribution to doing sth,所以reduce改成reducing