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 realizedB．did I realizeC．had I realizedD．I had realized
A
此句是I didn't realize that I had so many books to cover and so many exercises to finish until the entrance exams were in sight．的強調(diào)句。not until…in sight位于強調(diào)結構中，realize就變成肯定，用過去時。
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