单项选择题

A．He doesn’t understand his staff.
B．His computer doesn’t work properly.
C．He doesn’ t know how to apply computer theory.
D．He is unable to add the figures.
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Retailers and marketing firms have found that______with people in the virtual world.
单项选择题
A．Camp in the mountains.B．Stay at his own house.C．Write to his girlfriend.D．Hold his uncle’ s mails.
A．Camp in the mountains.
B．Stay at his own house.
C．Write to his girlfriend.
D．Hold his uncle’ s mails.
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