-()have you lived in shanghai?-Since we ()work here.

-()have you lived in shanghai?-Since we ()work here.
A.When;have found B.How long;found C.When;have found D.How long;have found
解析：答案是B.How long;found,关键词语Since ,从.到,从.起.
Since 的前面是现在完成时,Since 的后面是一般过去时.这样,直接把A、C、D排除,因为,第二空都是have+PP,现在完成时的结构.在推断how long是否可以填在第一空,看看,肯定能!
完整句子：We have lived in Shanghai since we found work here.是正确的.
说明：前面几位朋友的答案是对的,解析欠准确.