Ellen was a painter of birds and of nature, _____, for some reason, had withdrawn from all human societyA.whichB.whoC.whereD.whom
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B解析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)。Which修行先行词是物的定语从句;whom修饰先行词为人,且在从句中做宾语;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。