问题详情：
Paper money ________ for over a thousand years.
A．have been used B．has been used C．are used D．is using
【回答】
B money 为不可数名词，因此谓语用单数，又由“for…years”可知用完成式，所以选B。
知识点：主谓一致
题型：选择题
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