高等继续教育 / 大学英语I
正确率：100%
题型描述: 单选题
Johnˊs father _ _ _ _ _ _ mathematics in this school ever since he graduated from Harvard University.
A. is teaching
B. taught
C. has taught
D. teaches
Johnˊs father _ _ _ _ _ _ mathematics in this school ever since he graduated from Harvard University.
A. is teaching
B. taught
C. has taught
D. teaches
参考答案：