The river smells terrible．People must ________ dirty things in it．A.be stopped from throwingB.be stopped to throwC.stop to throwD.stop from throwing
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A解析根据第一句话，这条河闻起来很糟糕，可以从两方面解决这个问题：一是人们主动的停止向河里扔脏东西，应是stop throwing；二是人们被阻止向河里扔脏东西，应是be stopped(from)throwing．