Although he was under no obligation the shopkeeper replaced the defective battery free of charge.

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问题 Although he was under no obligation the shopkeeper replaced the defective battery free of charge.

选项 A、guarantee
B、duty
C、power
D、authority

答案B

解析 to be under obligation“有责任，有义务”。选项中只有B．duty有“责任”之意，与之意思相近。guarantee“保证”；power“能力”；authority“权威，权力”。

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