-HowcomeyourfathercanreadbooksinGerman?    -Well,he___...

问题详情：

  -How come your father can read books in German?

     -Well, he____ on a project with some German engineers for 3 years when he was young.

     A. had worked     B. was working        C. worked              D. would work

【回答】

C

知识点：一般过去时及其被动式

题型：选择题