The college student lost his life trying to save the drowning child, he will always be re

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A. in which
B. about which
C. by which
(答案→)D. for which
解析：答案：D　考查非限制性定语从句。分析句子结构可知，逗号后为定语从句，先行词为逗号前整句话内容，语境表示“因他所做的一切，他将永远被铭记”。在选项中，介词for可表示原因，符合题意，因此，空格处应用for which来引导定语从句。故答案选D。