题目内容
Paper money ________ for over a thousand years.
A.have been used B.has been used C.are used D.is using
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。
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题目内容
Paper money ________ for over a thousand years.
A.have been used B.has been used C.are used D.is using
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。