单项选择题

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

A．on
B．at
C．in
D．for
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单项选择题
To ______ these two ideas is impossible, they are too different.
A．match
B．bond
C．reconcile
D．compromise
单项选择题
Who won the election for mayor A man ______ to represent every minority group in the city.
A．claim
B．is claimed
C．claimed
D．claiming
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