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.

1. A.
   I realized
2. B.
   did I realize
3. C.
   had I realized
4. D.
   I had realized

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.

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

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

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.