单项选择题

A．Once.
B．Twice.
C．Three times.
D．Never.
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单项选择题
A．Take a break.B．Go to work.C．Do the other problems.D．Keep trying.
A．Take a break.
B．Go to work.
C．Do the other problems.
D．Keep trying.
单项选择题
A．Paris.B．Copenhagen.C．New York.D．London.
A．Paris.
B．Copenhagen.
C．New York.
D．London.
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