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People have planted a lot of trees and grass in order to ____ wind and sand in the desert.
A．hold downB．hold upC．hold backD．hold out
C
hold down 壓制，限制；hold up推遲，耽擱；hold back 阻擋，抑制； hold out提供，提出。句意：人們種了大量的樹(shù)和草，為了阻擋風(fēng)沙。 
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