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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 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。 
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