问题
选择题
Something must be done to prevent our city ____ by thick smoke.
A．to be polluted
B．from polluting
C．from being polluted
D．polluting
答案
答案：C
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Something must be done to prevent our city ____ by thick smoke.
A．to be polluted
B．from polluting
C．from being polluted
D．polluting
答案：C