We must do something to _____ the factories sending outpoisonous gases so as to keep the city_____.[

题目简介

We must do something to _____ the factories sending outpoisonous gases so as to keep the city_____.[

题目详情

We must do something to _____ the factories sending out   poisonous gases so as to keep the
city_____.      
[     ]
A. keep; being polluted      
B. keep; from being polluted    
C. prevent; being polluted      
D. prevent; from being polluted
题型:单选题难度:中档来源:同步题

答案

D

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