These old pictures bring to their mind the college days they spent together, life was ha

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A. when; whose
B. which; whose
(答案→)C. which; when
D. when; which
解析：句意：这些旧照片使他们想起他们一起度过的大学时代,当时生活很艰苦,但是很开心。先行词days后接了两个定语从句，第一个定语从句中动词spent 后缺少宾语，因此第一空填关系代词which作宾语;第二个定语从句主语和表语都完整，所以第二空填关系副词when。故选C。