单项选择题

We were talking on the phone when we were ______.

A．cut down
B．cut off
C．hung up
D．hung back
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单项选择题
She won't contact you, ______ something unforeseen happens.
A．as
B．since
C．though
D．unless
单项选择题
The town is famous for its ______ bridge.
A．unique grey ancient stone
B．grey unique ancient stone
C．unique ancient grey stone
D．ancient grey unique stone
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