单选题 Robert S. Duncanson was considered a painter of the Hudson River School, ______ on scenes of America"s unturned wilderness.
【正确答案】 A
【答案解析】[解析] 句意：Robert S. Duncanson被公认为是哈德逊河画派的画家，哈德逊河画派专注于描绘美国荒野的景象。本题考查非限制性定语从句的用法，先行词是Hudson River School。