单项选择题

A．1520.
B．6020.
C．1755.
D．1620.
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单项选择题
A．To a bar opening.B．To a cinema opening.C．To an art gallery opening.D．To an office opening.
A．To a bar opening.
B．To a cinema opening.
C．To an art gallery opening.
D．To an office opening.
填空题
Although most nations around the world have agreed upon GSM data transmission protocol for cellphones, the US has avoided official ______.
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