单项选择题

I ______ a taxi when it was raining.

A．used to take
B．used to taking
C．used to be taking
D．was used to taking
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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
At the moment the machine ______ at full speed.
A．ran
B．was running
C．had been running
D．had run
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