31. We should think of ways to stop the waste from the factory _____ our living environment.
A．being pollutedB．pollutingC．from being pollutedD．Polluted
B
根據(jù)“廢物”與“環(huán)境”的關(guān)系，“廢物”污染“環(huán)境”，為主動發(fā)出的動作.
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