单项选择题

A．About every five minutes.
B．About every six minutes.
C．About every seven minutes.
D．About every eight minutes.
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单项选择题
A．To go shopping.B．To do research for her story.C．To meet her professor.D．To take a break from her work.
A．To go shopping.
B．To do research for her story.
C．To meet her professor.
D．To take a break from her work.
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