Question

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

1. A.
   has completed
2. B.
   have completed
3. C.
   have been completed
4. D.
   has been completed

Answer 1

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。