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
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
单项选择题
Her story shows how gentle .______and an indifference to honors and fame can lead to great achievements.
A．persuasion
B．determination
C．devotion
D．reservation
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