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
<上一题 目录 下一题>
热门 试题

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
The issue ______at the conference is very important and it will create a sensation nationwide.
A．discussed
B．being discussed
C．is being discussed
D．has been discussed
相关试题