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