单项选择题

A．800 years.
B．400 years.
C．550 years.
D．2,000 years.
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单项选择题
A．Experimental medicines.B．Special treatment centers.C．Flexible working schedule.D．Innovative physical exercises.
A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
单项选择题
A．She went shopping.B．She did some sewing.C．She repaired her car.D．She bought some tobacco.
A．She went shopping.
B．She did some sewing.
C．She repaired her car.
D．She bought some tobacco.
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