- Have you known each other for long?
- Not really. we started to work in this school.
A. Just after
B. Just when
C. Ever since
D. Just before
网友回答
A. Just after
B. Just when
(答案→)C. Ever since
D. Just before
解析：考查连词：A. Just after就在…后面，B. Just when就在…时候，C. Ever since自从，D. Just before就在…前面，句意：--你们认得彼此很长时间了吗？--不是，（我们认得）是自从在这个学校学习以来。这句话的主句We have known each other被省略了，所以从句用ever since（和现在完成时连用），选C。