单项选择题

Mark Twain usually forgot something because he ______.

A．was ill
B．was very busy
C．couldn’t remember anything
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单项选择题
If Mark Twain couldn't find his ticket, ______.
A．he had to buy another one
B．he had to get off the train
C．he couldn't know where he was going
单项选择题
When he was on the train, the conductor ______.
A．wanted to talk with him
B．knew his name
C．wanted to see his ticket
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