【单选题】
He isn't legally responsible for his nephew, but he feels he has a moral ______ to help him.
A.observation
B.obligation
C.objection
D.obstruction
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根据网考网移动考试中心的统计,该试题:
3%的考友选择了A选项
89%的考友选择了B选项
5%的考友选择了C选项
3%的考友选择了D选项