单项选择题

A．1170
B．1530
C．1668
D．1669
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单项选择题
A．English language proficiencyB．different cultural practicesC．different negotiation tasksD．the international Americanized style
A．English language proficiency
B．different cultural practices
C．different negotiation tasks
D．the international Americanized style
单项选择题
America's first backbone Internet Service provider was ______.
A．EarthLink
B．MCI
C．GTE Corp
D．NSFNET
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