---how long ___ each other before they ___ married
问题描述:
---how long ___ each other before they ___ married
--- For about a year.
a.have they known ; get b.had they known ; got
为什么要用b不用a 怎么理解的?
答
都是过去发生的动作,但“认识”是在“结婚”之前,要用过去完成时态.