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。
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