问题
选择题
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
答案
答案：D
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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
答案：D