问题
选择题
The construction of the two new railway lines ________ by now.
A．have been completed
B．has been completed
C．has completed
D．have completed
答案
答案：B
考查时态及语态，根据题中的时间by now，应用现在完成时态，句意：到现在为止两条新铁路线的建造已经被完成了。根据语境应用被动语态，所以选B。