单项选择题

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

A．guarantee
B．duty
C．power
D．authority
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单项选择题
Let's arrange the provisional meeting for next Wednesday, even though we may have to change it.
A．tentative
B．practical
C．local
D．commercial
单项选择题
The mother counselled her daughter on how to behave at the ball.
A．conferred
B．advised
C．reproved
D．congratulated
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