Cheap labor (scarcity was) in the cotton plantations (of the) American South, and (slaves) became (standard) practice.

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问题 Cheap labor (scarcity was) in the cotton plantations (of the) American South, and (slaves) became (standard) practice.

选项 A、scarcity
B、of the
C、slaves
D、standard

答案B改为in the

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