By the end of last year,another new subway__in shanghai.

By the end of last year,another new subway__in shanghai.

题目
By the end of last year,another new subway__in shanghai.
A.would be completed B.was being completed
C.has been completed D.had been completed
答案
D.by the end of last year 意为“到去年年底”,用于过去完成时态.
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