. They did everything they could to prevent the pollution the river.A. protectingB. to pr

发布时间：2020-08-16 11:51:00


. They did everything they could to prevent the pollution      the river.
A. protecting
B. to protect
C. from being protected
D. from protecting

网友回答

A. protecting
(答案→)B. to protect
C. from being protected
D. from protecting
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