题目内容
To prevent the air ________, something will have to be done.
[ ]
A.to pollute
B.to be polluted
C.from polluting
D.from being polluted
答案:D
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题目内容
To prevent the air ________, something will have to be done.
A.to pollute
B.to be polluted
C.from polluting
D.from being polluted