单项选择题

No one has turned on the air conditioner______.

A． yet
B． never
C． already
D． soon
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单项选择题
Feel free to ______the engineer for more assistance.
A． call on
B． call to
C． call forward
D． call at
单项选择题
Please refer to your personal ______number.
A． identify
B． identities
C． identification
D． identified
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