单项选择题

A．accelerator
B．actor
C．amplifier
D．observer
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单项选择题
A．Because all rooms are taken.B．Because many spare rooms are available.C．Because there are only double rooms.D．Because there is just a single room.
A．Because all rooms are taken.
B．Because many spare rooms are available.
C．Because there are only double rooms.
D．Because there is just a single room.
单项选择题
A．The plane is full.B．The plane is late.C．The plane has broken down.D．The flight is canceled.
A．The plane is full.
B．The plane is late.
C．The plane has broken down.
D．The flight is canceled.
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