He may be late .What's_____he doesn't know the change of the place for the meeting.
热心网友
楼上有误此句的固定用法是 what is it he doesn't know about ? what is it he doesn't know the change......examples: what is it (that) you want? what is it you have so many questions about.....
热心网友
for
热心网友
If
热心网友
that