问题:
31. We should think of ways to stop the waste from the factory _____ our living environment.
A.being polluted
B.polluting
C.from being polluted
D.Polluted
31. We should think of ways to stop the waste from the factory _____ our living environment.
A.being polluted | B.polluting | C.from being polluted | D.Polluted |
参考答案: