Every possible means been taken to prevent the river .A. have; pollutingB. has; pollutedC

问题补充：

Every possible means been taken to prevent the river .

A. have; polluting

B. has; polluted

C. has; from being polluted

D. have; being polluted

答案：

A. have; polluting

B. has; polluted

(答案→)C. has; from being polluted

D. have; being polluted

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