问题
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
B: hold up
C: hold back
D: hold out
正确答案是：
同类题型
Recently a terrible earthquake happened in Sichuan, ____the people are still suffering
_________difficult questions the teacher is asking! Only a few students can answer them!
There will be less pollution _____ more people use public transportation.
Let’s climb the mountain.—I don’t agree. _______ the mountain will make us exhausted.