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

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

A.has completed

B.have completed

C.have been completed

D.has been completed

答案及解析： D

解析：

句意：两条新铁路线的建设到现在已经完成了。此题在选择的时候要注意：一要把握好时间状语by now，句子中要用现在完成时；

二要注意句子的主语为construction，谓语动词应用单数形式；

三要注意用被动语态。