-HowcomeyourfathercanreadbooksinGerman?    -Well,he___...

問題詳情：

  -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

知識點：一般過去時及其被動式

題型：選擇題