People have planted a great many trees 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，為了陰擋風和沙塵。由此可知答案為C項。
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