题目内容：

The river smells terrible.People must ___ dirty things into it.这个问题可以用主动语态吗?

优质解答

1 have thrown / put / poured -------你的句子本来就是主动语态.
2 stop putting / pouring / throwing

追问：

为什么stop 后面不加from?

追答：

你好。如果是- - -- from - -- -，就必须是： we must stop people from putting dirty things into the river stop sb from doing sth ------不让某人做某事