99. John’s father _________ mathematics in this school ever since he graduated from Harvard University. A. taught B. teaches C. has taught D. is teaching 约翰的爸爸从哈佛大学毕业后就一直在这所学校里教数学。

99. John’s father _________ mathematics in this school ever since he graduated from Harvard University.
A. taught B. teaches C. has taught D. is teaching
约翰的爸爸从哈佛大学毕业后就一直在这所学校里教数学。

出自：东华大学大学英语4

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