the water is the river isn't as clean as before,people must_____dirty things into itAbe stopped to throw Bbe stopped from throwing Cstop to throw Dstop from throwing

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the water is the river isn't as clean as before,people must_____dirty things into itAbe stopped to throw Bbe stopped from throwing Cstop to throw Dstop from throwing
the water is the river isn't as clean as before,people must_____dirty things into it
Abe stopped to throw Bbe stopped from throwing Cstop to throw Dstop from throwing

the water is the river isn't as clean as before,people must_____dirty things into itAbe stopped to throw Bbe stopped from throwing Cstop to throw Dstop from throwing
B吧

选C

B

C.

D,阻止做某事和Keep,Prevent from doing sth
一样的!