题目
How long ____each other before they _____ married
A have they known ,get B did they know ,were going to get C do they known ,are going to get D had they known ,got
A have they known ,get B did they know ,were going to get C do they known ,are going to get D had they known ,got
提问时间：2020-10-13
答案
选D BEFORE一个过去式用过去完成时
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