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Every possible means _______ been taken to prevent the river _________.
A.have; pollutingB.has; polluted
C.has; from being pollutedD.have; being polluted

答案
C
解析

核心考点
试题【Every possible means _______ been taken to prevent the river _________.A.have; p】;主要考察你对一般现在时等知识点的理解。[详细]
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