I’m sorry you’ve been waiting for us so long but it’s still be some timethe meeting starts

问题补充：

I’m sorry you’ve been waiting for us so long，but it’s still be some timethe meeting starts.

A before B since C till D after

答案：

解析：考查连词的用法。it’11 still be some time before……是一个句型，表示在……之前有一段时间了。