—John’s father ______mathematics in this school ever since he graduated from ...

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问题 —John’s father ______mathematics in this school ever since he graduated from Harvard University.
选项 A. taught B. teaches C. has taught D. is teaching
答案 C
解析 自从约翰的爸爸从这所大学毕业以后,他在这所学校教数学。

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