21、The farmers are encouraged to stop growing crops and plant trees and grass on _____ hillside to keep the soil in _____ place.

A. the; a           B. the;  /         C. /;   a           D. /;    /

21、B

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The farmers are encouraged to stop growing crops and plant trees and grass on _____ hillside to keep the soil in _____ place.

A. the; a           B. the;  /         C. /;   a           D. /;    /

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