单项选择题

A．4 years
B．5 years
C．8 years
D．at least 9 years
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单项选择题
A．Friday.B．Saturday.C．Sunday.D．Monday.
A．Friday.
B．Saturday.
C．Sunday.
D．Monday.
单项选择题
A．3 hours.B．8 hoursC．6 hours.D．9 hours.
A．3 hours.
B．8 hours
C．6 hours.
D．9 hours.
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