单项选择题

You should have put the milk into the ice-box, I expect it ______ undrinkable by now.

A．became
B．had become
C．has become
D．becomes
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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
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
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