Question

【题目】We should plant more trees because they can keep the soil _____ place.

A. to B. with C. in D. on

Answer 1

【答案】C

【解析】

句意：我们应该多植树, 因为它们可以保持水土不被流失。根据句意，可知这里要表达“保持水土”，固定短语keep the soil in place, 故选C。