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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单项选择题
The conductor told the old man that he didn't need to buy another ticket because___________.
A．the old man was a famous person
B．he thought the old man had no money with him
C．he believed the old man
单项选择题
Which of the following is still unknown to us
A．Whether the old man went on the trip with his wife.
B．Whether the old man found his ticket.
C．Whether the conductor believed the old man.
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