单项选择题

telephone is really ______ most useful invention, don't you think so

A．The,/
B．The, a
C．A, /
D．/ the
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单项选择题
______ ! There’s a little pool on your side.
A．Look out
B．Look over
C．Look aside
D．Look on
单项选择题
You'd better write down her number and address ______ you should need them.
A．unless
B．in case
C．on condition that
D．if only
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