题目内容
Every possible means _______ been taken to prevent the river _________.
A. have; polluting B. has; polluted
C. has; from being polluted D. have; being polluted
C
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题目内容
Every possible means _______ been taken to prevent the river _________.
A. have; polluting B. has; polluted
C. has; from being polluted D. have; being polluted
C