单项选择题

You should have your eyes tested every year in case the ______ of your spectacles need changing.

A．lenses
B．glasses
C．sights
D．crystals
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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
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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