It _____ we had stayed together for a couple of weeks _____ I found we had a lot in common. [ ]

A. was until; when

B. was until; that

C. wasn't until; when

D. wasn't until; that

旅客列车在运行途中遇车辆空气弹簧故障时，运行速度不得超过（）。采用密接式车钩的旅客列车，在运行途中因故障更换15号车钩后，运行速度不得超过（）。