A.landlords
B.tenants
C.farmers
D.wage laborers
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A.Use of artificial fertilizer.
B.Introduction of new agricultural machinery.
C.The'Open-field'system.
D.A system of crop rotation.
A.The open field system provided a good opportunity to experiment.
B.The open field system wasted land.
C.The open field system was wasteful of labor and time.
D.The open field system made livestock farming difficult.
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