Question

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

1. A.
   had taught
2. B.
   taught
3. C.
   has taught
4. D.
   had been teaching

Answer 1

B
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。