D.had known
By the end of last year 截止到去年底 BY加過去時(shí)間可以看做過去完成時(shí)的標(biāo)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
英語人氣：754 ℃時(shí)間：2019-11-15 09:18:57
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