单项选择题

You will be late ______ you leave immediately.

A．unless
B．until
C．if
D．or
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单项选择题
What makes the space shuttle ______ is that it takes off like a rocket but lands like an airplane.
A．exceptional
B．strange
C．unique
D．rare
单项选择题
______ student with a little common sense should be able to answer the question.
A．Each
B．Either
C．Any
D．One
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