Question

—Forests are very important, aren’t they?
—Yes. They can prevent the water        washing the earth away.
A．for                  B．to                  C．from

Answer 1

C

试题分析：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。