问题
选择题
Every means ___ the river from being polluted.
A．are used to prevent
B．are used to preventing
C．is used to prevent
D．is used to preventing
答案
答案：C
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Every means ___ the river from being polluted.
A．are used to prevent
B．are used to preventing
C．is used to prevent
D．is used to preventing
答案：C