In the conference room on the fifth floor,where a meeting 【 】,some students were busily
问题描述：
In the conference room on the fifth floor,where a meeting 【 】,some students were busily
setting the table
A was to be held
B has been held
C wIll be held
D is being held
请问选什么 以及为什么?
答
A was to be held
表示将要被举行,指会议还没开,因此学生们正在忙着摆桌子.