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单项选择题
A．For about 10 minutes.B．For less than 5 minutes.C．For about 20 minutes.
A．For about 10 minutes.
B．For less than 5 minutes.
C．For about 20 minutes.
单项选择题
A．Their teacher.B．Their father.C．Mr. Green.
A．Their teacher.
B．Their father.
C．Mr. Green.
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