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A．When they learnt how to keep animals in herds.B．When they had to go about from place to place for food.C．Before they learnt how to plant crops.D．When they finally learnt the art of farming.
A．When they learnt how to keep animals in herds.
B．When they had to go about from place to place for food.
C．Before they learnt how to plant crops.
D．When they finally learnt the art of farming.
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