Farmers are allowed to grow small gardens of their own and they sell their ve...

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问题 Farmers are allowed to grow small gardens of their own and they sell their vegetables__________ the black market.

选项 A. on
B. at
C. in
D. for

答案A

解析考查介词搭配。on the market意为“上市，出售中”，句意为“农夫们被允许在自己的菜园耕种.并将蔬菜拿到黑市上去卖”。

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