问题
New ways _____ to prevent the river _____
A:have found out, from polluting
B:have found, from being polluted
C:have been found out, from being polluted
D:have been found, from being polluted
B:have found, from being polluted
C:have been found out, from being polluted
D:have been found, from being polluted
正确答案是：
同类题型
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