He failed the mid-term examination and o
题型:选择题
问题:
He failed the mid-term examination and only then _____ how much time he had wasted. [ ]
A. he realized
B. did he realize
C. he had realized
D. had he realized
He failed the mid-term examination and only then _____ how much time he had wasted. [ ]
A. he realized
B. did he realize
C. he had realized
D. had he realized