Stay in touch with people you really care about and really care about you.
A. who..who
B. whom..whom
C. who...whom
D. which...that
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(答案→)A. who..who
B. whom..whom
C. who...whom
D. which...that
解析：考查定语从句：句意：和真正在乎你而你又非常喜欢的人的保持联系。这两个空都是定语从句的关系词，先行词是people，第一个定语从句缺少宾语，第二个缺少主语，都可以用who引导定语从句，whom不能做主语，选A。