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
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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
单项选择题
Tom and Alice ______ having a new car to replace their old one for years.
A．has been dreaming of
B．have been dreaming of
C．has dreamed
D．will have dreamed
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