—How long have you retired Grandpa?—Well four years But you know I for Courtaulds for

问题补充：

—How long have you retired, Grandpa?

—Well, four years, But you know, I for Courtaulds for over forty years.

A. have worked

B. worked

C. had worked

D. Work

答案：

A. have worked

(答案→)B. worked

C. had worked

D. Work

解析：考查时态。 根据four years可知，爷爷已经退休四年了。所以我工作了四十年是发生在过去的事情。