问题标题:
Bytheendoflastyearwe___eachotherfortenyears.A.haveknownB.knewC.werelearningD.hadknown
问题描述:
Bytheendoflastyearwe___eachotherfortenyears.
A.haveknownB.knewC.werelearningD.hadknown
耿乃光回答:
D.hadknown
Bytheendoflastyear截止到去年底BY加过去时间可以看做过去完成时的标志
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