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