---I am going to Beijing during the ing summer holiday.
--- Great ! You about our capital well then.
A. will be knowing
B. will have known
C. have known
D. have been knowing
网友回答
(答案→)A. will be knowing
B. will have known
C. have known
D. have been knowing
解析：句意：--在将要到来的暑假期间，我去北京。--好的，那时你就能了解我们的首都了。根据am going to Beijing可知还没有去北京，故排除CD；then指的是将来在北京的时候，表示将来某个时候正在做某事，故选A。