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

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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
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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