--- _______ David and Vicky _____ married?
--- For about three yearsA.How long were; have beenB.How long have; have beenC.How long have; beenD.How long did; get
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C解析这题考查这题考查时态：从回答的：For about three years.可知是用现在完成时，因为是表示一段时间，所以动词应该是表示状态的词，不能是短暂动词。所以所C。