单项选择题

A．Because of modem technology.
B．Because of modern business practice.
C．Because of the Industrial Revolution.
D．Because of the amount of education and specialization.
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单项选择题
A．He has been to Seattle many times.B．He has chaired a lot of conferences.C．He holds a high position in his company.D．He lived in Seattle for many years.
A．He has been to Seattle many times.
B．He has chaired a lot of conferences.
C．He holds a high position in his company.
D．He lived in Seattle for many years.
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