问题

It was ______ in the exam that ______ how much time Ihad wasted.
A:not until IfailedI realized
B:until Ifailed I didn’t realize
C:not until Ifailed did I realize
D:until Ifailed I realized
B:until Ifailed I didn’t realize
C:not until Ifailed did I realize
D:until Ifailed I realized
正确答案是: