问题
选择题
Every means ______ prevent the water from ______.
A．are used to; polluting
B．is used to; polluting
C．is used to; polluted
D．is used to; being polluted
答案
答案：D
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Every means ______ prevent the water from ______.
A．are used to; polluting
B．is used to; polluting
C．is used to; polluted
D．is used to; being polluted
答案：D