单项选择题

Where was the first telephone service in America established

A．New York.
B．Washington.
C．Philadelphia.
D．Chicago.
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单项选择题
Before the Bell Company became a publicly held corporation, how were the calls passed to their destinations
A．Manual switchboards.
B．Reading manuals.
C．Electronic switchboards.
D．Voice switches.
单项选择题
When is the professor in the office
A．Saturday.
B．Thursday.
C．Wednesdays.
D．Friday.
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