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
网友回答
A. have found out, from polluting
B. have found, from being polluted
C. have been found out, from being polluted
(答案→)D. have been found, from being polluted
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