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The construction of the two new railway lines ________ by now.

[  ]

A.has completed
B.have completed
C.have been completed
D.has been completed

答案:D
解析:

by now时间状语看,应用现在完成时;从文意看,应用被动语态,从主谓一致看,应使用单数,故选D项。


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