单项选择题

A．One piece.
B．Two pieces.
C．Three pieces.
D．Four pieces.
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单项选择题
A．Average tuition costs increased by 9 percent.B．Average tuition costs increased by 15 percent.C．Average tuition costs increased by 90 percent.D．Average tuition costs increased by 150 percent.
A．Average tuition costs increased by 9 percent.
B．Average tuition costs increased by 15 percent.
C．Average tuition costs increased by 90 percent.
D．Average tuition costs increased by 150 percent.
单项选择题
A．In the 16th century.B．In the 17th century.C．In the 18th century.D．During the Middle-ages.
A．In the 16th century.
B．In the 17th century.
C．In the 18th century.
D．During the Middle-ages.
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