单项选择题

You can't get a driver's license ________ you are at least sixteen years old.

A．unless
B．if
C．when
D．though
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单项选择题
The accident was my fault, so I had to pay for the damage ________ the other car.
A．at
B．to
C．on
D．for
单项选择题
The harder I tried, ________ it seemed to solve that math problem.
A．the impossible
B．most impossible
C．the more impossible
D．the most impossible
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