．People have planted a lot of trees and grass in order to ____ wind and sand in the desert．
| A．hold down | B．hold up | C．hold back | D．hold out |
相关试题
John's success has nothing to do with good luck. It is years of hard work has made him what he is today.
| A．why | B．when |
C．which | D．that |
This coastal area a national wildlife reserve last year.
| A．was named | B．named | C．is named | D．names |
You buy a gift, but you can if you want to.
| A．must | B．mustn't | C．have to | D．don't have to |
Father goes to the gym with us although he dislikes going there.
| A．hardly | B．seldom | C．sometimes | D．never |
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