单项选择题

A．Doctor and patient.
B．Passenger and bus driver.
C．Daughter and mother.
D．Customer and merchant.
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单项选择题
A．He needs to press F7 to return to the document before he prints it.B．He has to print the document to see the page numbers.C．The printer is not working correctly.D．The numbers are on the screen but they don’t print out.
A．He needs to press F7 to return to the document before he prints it.
B．He has to print the document to see the page numbers.
C．The printer is not working correctly.
D．The numbers are on the screen but they don’t print out.
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