2. 外语
  3. Farmers are allowed to grow small gardens of their own and they sell their vegetables______the black market.

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

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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 on the market意为“上市，出售中”，其他介词搭配不合适。故选A。
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