单项选择题

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

A． if
B． unless
C． when
D． though
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单项选择题
The representative of the company demanded that part of the agreement _________revised.
A． will be
B． is
C． to be
D． be
单项选择题
The harder I tried, _________it seemed to solve that math problem.
A． the impossible
B． most impossible
C． the most impossible
D． the more impossible
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