He failed the midterm examination and only then ________how much time he had wasted. 
#82282
A
he realized
B
did he realize
C
he had realized
D
had he realized
推荐题目
We must apply what we have learned to our daily work because in no case_____ from practice.
#81130
A
should theory separate
B
theory should be separated
C
theory should separate
D
should theory be separated
Never_____ to the foreign invaders, no matter how powerful they seem to be.
#79640
A
we can give in
B
we should give up
C
can we give in
D
should we give up