We must do something to the factories sending out poisonous gases so as to keep the city

发布时间：2020-08-16 13:03:59

We must do something to      the factories sending out poisonous gases so as to keep the city clean and beautiful.
A. keep
B. protect
C. permit
D. prevent

网友回答

A. keep
B. protect
C. permit
(答案→)D. prevent
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