题目内容
Not until____________the exam _________ the importance of doing homework.
A.had he failed; he realized | B.he had failed; did he realize | C.he had failed; he realized | D.had he failed; did he realize |
B
解析

练习册系列答案
相关题目
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
A.who |
B.that |
C.where |
D.before |