问题补充:
---How long has your brother been working here?
--- he graduated from college in .
A. When
B. Until
C. Long before
D. Ever since
答案:
A. When
B. Until
C. Long before
(答案→)D. Ever since
解析:上文意思是,你的哥哥来这里工作多久了?下文意思是从他从大学毕业。When当……时候 Until知道 Long before 很久以前 Ever since 自从,故选D,最符合题意。