单项选择题

You（）all those calculations! We have a computer to do that sort of thing.

A．needn't have done
B．must not have done
C．shouldn't have done
D．can not have done

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单项选择题
I don't swim now, but I（）when I was a kid.

A．used to it
B．used to doing it
C．used to
D．used to do
单项选择题
He went ahead（）all warnings about the danger of his mission.

A．in case of
B．because of
C．regardless of
D．prior to
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