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The construction of the two new railway lines ________ by now.
A.have been completedB.has been completed
C.has completedD.have completed
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。
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