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--How long ___________ each other before they__________ married?
--For about a year.
A．have they known;getB．did they know; were going to get
C．do they know;are going to getD．had they known; got
D
根據(jù)句意分析，他們結(jié)婚是已過去的事，那么，他們互相了解大約一年的時(shí)間肯定發(fā)生在結(jié)婚前，發(fā)生在過去某一動(dòng)作之前的動(dòng)作，應(yīng)該使用過去完成時(shí)。
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