单项选择题

Our boss is taking everyone to the ballet tonight, and I need to make sure my new dress ______ for the occasion.

A．has been cleaned
B．should have been cleaned
C．is being cleaned
D．has been cleaning
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单项选择题
______ the heavy pollution, the city officials have decided to cancel school for the day.
A．Prior
B．By means of
C．Due to
D．Through
单项选择题
When the air in a certain space is squeezed to occupy a smaller space, the air is said to be ______.
A．commenced
B．compressed
C．compromised
D．compensated
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