单项选择题

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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单项选择题
Countries within the European Economic Community grant certain commercial ______ to each other.
A．advantages
B．benefits
C．privileges
D．subsidies
单项选择题
The badly wounded have ______ for medical attention over those slightly hurt.
A．curiosity
B．generosity
C．priority
D．authority
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