Mr. Irvine who in a high school for forty years is now living in retirement. A. had tau

问题补充：

Mr. Irvine, who in a high school for forty years, is now living in retirement.

A. had taught

B. taught

C. has taught

D. had been teaching

答案：

A. had taught

(答案→)B. taught

C. has taught

D. had been teaching

解析：考查 动词的时态。根据is now living in retirement，可知他在高中工作四十年是发生在过去，所以要用一般过去时态。选B。