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题目内容
（国家开放大学人文英语4）
John.s father _________ mathematics in this school ever since he graduated from Harvard University.
单选题 (10 分) 10分
A.
taught
B.
teaches
C.
has taught
单选题 (10 分) 10分
A.
taught
B.
teaches
C.
has taught
参考答案
