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问题: the two children bought some books( )the money they had saved .A with , B by

the two children bought some books( )the money they had saved .A with , B by 修改

解答:

A with.
表示方式,方法,手段的区别.即
确定性和具体性(由大到小)
with>by>though
with的意思更明确.