单项选择题

You can't drink alcohol（）you are at least eighteen years old in some states of the US.

A．if
B．unless
C．though
D．when

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单项选择题
It's getting dark; we'd better make（）home.

A．out
B．up
C．for
D．of
单项选择题
We should be able to do the job for you quickly,（）you give us all the necessary information.

A．as if
B．provided that
C．in case
D．so that
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