People have planted a lot of trees and grass in order to ____ wind and sand in t

题型：不详难度：来源：

People have planted a lot of trees and grass in order to ____ wind and sand in the desert.

A．hold down

B．hold up

C．hold back

D．hold out

答案

C

解析

hold down 压制，限制；hold up推迟，耽搁；hold back 阻挡，抑制； hold out提供，提出。句意：人们种了大量的树和草，为了阻挡风沙。