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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

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

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

.People have planted a great many trees in order to _____ wind and sand in the desert.

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