问题
Many students didn’t realize the importance of study _______ they left school.
A:when
B:until
C:after
D:unless;
B:until
C:after
D:unless;
正确答案是：
同类题型
1－ I need something for cutting the paper. － Oh,you want a knife? OK, I’ll get ______ for you.
a shame! We misunderstood each other for such a long time.—Yes, I wish I _____ with you earlier.
He _______ any money in the lottery yet, but he expects to.[ ]
How is your recent trip to Sichuan—I’ve never had ______ one before.