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问题: 一道单选题,请详细解释

He is a student at Oxford University, _________ for a degree in computer science.
A. studied B. studying C. to have studied D. to be studying

解答:

选B
现在分词作状语,表示伴随的状况。
他是牛津大家的学生,(正在)为取得计算机科学学位而努力。