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单项选择题
A．He needs to press F-7 to return to the document before be 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 F-7 to return to the document before be 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.
单项选择题
A．At 5 years old.B．At 6 years old.C．At 7 years old.D．It’s not clear.
A．At 5 years old.
B．At 6 years old.
C．At 7 years old.
D．It’s not clear.
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