题目内容：

---Forests are very important to us ,aren't they?---Yes.If we have more forests ,they will help
yo keep () from running away.
A.water
B.leaves
c.trees
D.grass

优质解答

A

追问：

why?

追答：

常识。有森林， 有树， 才可把水留住 keep sb from doing sth 阻止某人做什么