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剑桥少儿英语第二级A第9课习题
Jack is twice as old as Bill,who is eight years younger than Ben,who is four years younger than Ted,who is half as old as Jack.How old is Bill?
Jack的年龄是Ted的两倍,Ben比TED小4岁,Bill比Ben小8岁,Jack的年龄是Bill的两倍.问Bill的年龄?
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