问题
I failed again in the examination and only then _____ how much time I had wasted.
A:I realized
B:I had realized
C:did I realize
D:had I realized
B:I had realized
C:did I realize
D:had I realized
正确答案是：
同类题型
I regret ______ that I’m too busy ______ inthe talk.
That must have been a lot of work.—Yeah, it ________ us three days to finish it
He was about to do his homework when an unusual noise________ his attention
What is Mum cooking in the kitchen—Fish, I guess. How nice it _______ !
.Hardly could he _________this amount ofwork in such a short of time.