问题
Sally, I went to the concert last night. How big the hall is!—So it is. It is to hold more than one thousand people.
A:what time we set off
B:what time we will set off
C:what time did we set off
D:what time will we set off;
B:what time we will set off
C:what time did we set off
D:what time will we set off;
正确答案是：
