D.had known
By the end of last year 截止到去年底 BY加过去时间可以看做过去完成时的标志
By the end of last year we ___ each other for ten years.
By the end of last year we ___ each other for ten years.
A.have known B.knew C.were learning D.had known
A.have known B.knew C.were learning D.had known
英语人气：347 ℃时间：2019-11-15 09:18:57
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