Whenever I met her, was very often, she greeted me with a sweet smile.
A. who
B. which
C. when
D. since
网友回答
A. who
(答案→)B. which
C. when
D. since
解析：考查定语从句。本题考查的是非限制性定语从句，which指代前面一句话的内容在定语从句中主语。句意：无论何时我遇见她，这是常有的事情，她总是面带微笑。D项不能引导定语从句。A项的先行词要是人；when在句中做状语。故B正确。