单项选择题

They hope to see you again ______.

A．before long
B．long before
C．long ago
D．after long
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单项选择题
Professor Smith ______ China yesterday.
A．arrived at
B．got to
C．arrived in
D．reached for
单项选择题
The students made him ______ of the class.
A．a monitor
B．the monitor
C．monitors
D．monitor
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