问题描述：
一道英语选择题,帮我分析下A和C 两个选项
（ ）so much in the war has made him more thoughtful.
A、his seeing B、to have seen C、having seen D、for him to see
（ ）so much in the war has made him more thoughtful.
A、his seeing B、to have seen C、having seen D、for him to see
问题解答：
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