问题
选择题
People have planted a great many trees in order to________wind and sand in the desert.[ ]
A．hold down
B．hold up
C．hold back
D．hold out
答案
答案：C
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People have planted a great many trees in order to________wind and sand in the desert.[ ]
A．hold down
B．hold up
C．hold back
D．hold out
答案：C
