单项选择题

Questions 15-17 are based on the following passage. 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.

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单项选择题

单项选择题

Questions 15-17 are based on the following passage. Before the Bell Company became a publicly held corporation, how were the calls passed to their destinations 您的浏览器不支持 audio 元素。