It was not until the entrance exams were in sight that__________ that I had so many books to

cover and so many exercises to finish.

A．I realized

B．did I realize

C．had I realized

D．I had realized

干槽症症状出现的时间是（）

A.拔牙当天

B.拔牙术后3天

C.拔牙术后7天

D.拔牙术后14天

E.拔牙术后30天