—Forests are very important, aren’t they

问题选择题

—Forests are very important, aren’t they?

—Yes. They can prevent the water washing the earth away.

A．for B．to C．from

答案

答案：C

题目分析：句意:森林是重要的，对吗？-是的，他们可以防止水把土壤冲走。prevent sth. from doing sth. 阻止某人做某事。这是一个固定的句型，介词应该用from。for 为了，因为；to 到。