---How long ________ each other before they ________ married?---For about a year.A.have they known; getB.did they know; were going to getC.do they know; are going to getD.had they known; got
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D解析考查动词时态的用法．“了解对方”应该发生在“结婚”这一动作之前，故第一空用过去完成时来表示“在过去某一动作或时间之前已经完成或发生的动作”．