－Miss Jones once music at a local college for ten years and now is an actress.－No wonder

问题补充：

－Miss Jones once music at a local college for ten years and now is an actress.

－No wonder I often hear her sing some pop songs.

A. had taught

B. has been teaching

C. taught

D. is teaching

答案：

A. had taught

B. has been teaching

(答案→)C. taught

D. is teaching

解析：考察时态。本题很容易错选B项现在完成时。现在完成时表示的是过去事情对现在的影响。而本题实际上是使用一般过去时与后面的now is an actress构成对比关系，表示过去和现在。句意：Jones小姐在当地的一所大学里教了的音乐，现在是一名演员。本句是现在与过去的对比，故C正确。