问题补充：
-Is your father a teacher of English in the No.l Middle School?
-No! But he English there for ten years.
A. has taught
B. has been teaching
C. taught
D. had taught
答案：
A. has taught
B. has been teaching
(答案→)C. taught
D. had taught
解析：考查情景交际和时态。句意：你爸爸是一中的英语老师吗？不！但是他在那里教过十年英语。根据句意可知，他爸爸以前教英语，现在已经不再教书了。应该用一般过去时。现在完成时指动作已经结束或动作对现在造成了影响；现在完成进行时指动作发生在过去，还会持续下去；过去完成时使用的前提是，出现一个过去的动作。排除A、B、C；故选C。
