---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)婚已是過去的事，那末，他們互相了解大約一年的時間肯定發(fā)生在結(jié)婚前，發(fā)生在過去某一動作之前的動作，應該使用過去完成時。
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