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By the end of last year the railway___.A.was being completed B.would be completed C.had completed D.had been completed

题目详情
By the end of last year the railway___.
A.was being completed B.would be completed C.had completed D.had been completed
▼优质解答
答案和解析
过去last year by the end of last year一般用在过去完成时,表示在去年的年底,某人已经完成了……例如 By the end of last year he_had learned