【题目】Ellen was a painter of birds and of nature，__________，for some reason, had withdrawn from all human society.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
在线课程【答案】B
【解析】艾伦是一个专画鸟类和自然的画家，由于某种原因，她已经远离了人类社会。who引导非限制性定语从句，在从句中作主语，修饰先行词Ellen（人名）。which修饰先行词是物的定语从句；whom修饰先行词为人，且在从句中作宾语；where修饰的先行词是地点名词，且在从句中作地点状语，均不符合语境，故排除。