单项选择题

A．At least once a month.
B．At least twice a month.
C．At least once a year.
D．At least twice a year.
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单项选择题
A．Check to see if it can still be fixed for free.B．Check to see what the problem is.C．Find where they have put the warranty.D．See if Mike is available.
A．Check to see if it can still be fixed for free.
B．Check to see what the problem is.
C．Find where they have put the warranty.
D．See if Mike is available.
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