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
I was quite at a loss ______ next.
A．what's to do
B．what to do
C．what to be done
D．how to do
单项选择题
Did you ever go there I ______ go there by myself.
A．used
B．used to
C．am used to
D．was used to
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