【题目】Ellen was a painter of birds and of nature, _____, for some reason, had withdrawn from all human society.
A.which
B.who
C.where
D.whom

【答案】B
【解析】句意：句意：埃伦是一个专画鸟类和大自然的画家。因为某种原因，她远离了人类社会。who引导非限定性定语从句，在从句中做主语，修饰先行词Ellen（人名）。选B。A.which修行先行词是物的定语从句；C.whom修饰先行词为人，且在从句中做宾语；D. where修饰先行词是地点名词，且在从句中地点状语，均不符合语境，故排除。