necessary experience for my future career, I take an active part in social activities in college.
A. To gain
B. Gain
C. Gaining
D. Having gained
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(答案→)A. To gain
B. Gain
C. Gaining
D. Having gained
解析：句意：为了获得未来生活必要的经验，我在大学积极参加社会活动。这里需要的是目的状语，只有不定式可以做目的状语，所以选A。