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Whenever I met her, _____ was fairly often, I was greatly impressed by her sweet smile.
A、which
B、what
C、that
D、who
【正确答案】：A
【题目解析】：本题考查定语从句中关系代词的选择，定语从句是对前面的补充说明，因此这是一个非限定性定语从句，关系代词指代前面一个句子，故用which。