单项选择题

Their manager will come to visit our company ______ a month.

A．at
B．on
C．in
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单项选择题
The old man bought a ticket___________.
A．after he got on the train
B．before he got on the train
C．as soon as the conductor told him to buy one
单项选择题
About an hour later, the conductor began___________.
A．to buy the tickets
B．to sell the tickets
C．to check the tickets
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