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
The trade unions in this industry are ______ any reduction in wages.
A．objecting against
B．opposed to
C．reacted to
D．resisting against
单项选择题
Many automobile accidents were ______ careless driving.
A．attributed to
B．resulted in
C．contributed to
D．raised from
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