Question

-Miss Jones once _________ music at Bardon School for ten years and now is an actress.
-No wonder I often hear her sing in the garden. y

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

Answer 1

B
由后面的and now可以知道前面指的是过去的时间，表示对比。