—Long time no seeHaven't you graduated from college?—Yes．Ibusiness management for 4 years

问题补充：

—Long time no see．Haven you graduated from college?

—Yes．Ibusiness management for 4 years in Beijing．

A. study

B. have studied

C. studied

D. am studying

答案：

A. study

B. have studied

(答案→)C. studied

D. am studying

解析：考查一般过去时。A 一般现在时；B现在完成时；C一般过去时；D现在进行时。根据语境“Yes”可知“已大学毕业了”，所以“在北京学商业管理四年”这个动作已结束，且对现在没影响，句子描述的是过去发生的动作，故用一般过去时。句意：——好久不见。你还没有从大学毕业吗？——不，我已毕业了。我在北京学了四年的商业管理。