单项选择题

A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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单项选择题
A．Three groups of learners.B．The importance of business English.C．English for Specific Purposes.D．Features of English for different purposes.
A．Three groups of learners.
B．The importance of business English.
C．English for Specific Purposes.
D．Features of English for different purposes.
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