单项选择题

Hello! Aviation Electronics Could I speak to Mr. Jones on _________ 8866, please

A．extension
B．branch
C．system
D．exchange
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单项选择题
This is an illness that can result in total blindness _________ left untreated.
A．after
B．if
C．since
D．unless
单项选择题
The whole embarrassing _________ in the bar was a great disappointment to them and set a bad example of English hospitality.
A．incident
B．accident
C．thing
D．matter
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