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
略
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题目内容
| A.have; polluting | B.has; polluted |
| C.has; from being polluted | D.have; being polluted |