---How long has your brother been working here?he graduated from college in .A. Wh

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。