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