单项选择题

I have been working for nearly 8 hours. I ______ at four o'clock.

A．was leaving
B．left
C．have left
D．am leaving
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Don't worry. We'll ______ all the debts to you within two years.
A．take away
B．pay off
C．get out
D．put aside
单项选择题
New technologies and skills will speed up the ______ of information.
A．transfer
B．traffic
C．trip
D．transport
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