单项选择题

At the moment the machine ______ at full speed.

A．ran
B．was running
C．had been running
D．had run
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单项选择题
The driver sitting in ______ front of the bus is my uncle.
A．the
B．×
C．an
D．a
单项选择题
You should take more physical . Don' t always sit at the desk doing your ______.
A．exercise, exercises
B．exercise, exercise
C．exercise, exercise
D．exercises, exercises
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