单项选择题

The______ he said it he knew what a mistake he had made.

A．moment
B．time
C．occasion
D．hour
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单项选择题
More thunderstorms .______in summer than any other time of the year.
A．happened
B．have happened
C．happen
D．will happen
单项选择题
By the time you have completed the essential training, you ______exposed to virtually every new feature of the course.
A．will have been
B．will be
C．would have been
D．would be
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