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
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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
单项选择题
Not until she bought her ticket and turned to walk away______that she was a streetcar conductor.
A．had I realized
B．did I realize
C．I realized
D．I had realized
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