单项选择题

The people are fully aware _______ they have before them problems and difficulties of various kinds.

A．of that
B．what
C．that
D．which
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单项选择题
If motorists had to pay an extra tax to drive in cities, they______their cars a lot less.
A．use
B．will use
C．used
D．would use
单项选择题
______the room temperature, she kept the heater on.
A．Kept on
B．Keeping up
C．So as to keep up
D．To keep up
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