单项选择题

Don't leave your luggage in the corridor. It'll be ______.

A．on
B．by
C．in
D．to
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单项选择题
We've done once but failed. We'll have to do it ______ time.
A．a second
B．the second
C．the twice
D．twice
单项选择题
Mary, along with her parents, ______ to Paris.
A．have moved
B．has moved
C．are moving
D．have been moving
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