【题目】With the help of advanced technology, many new subway lines _______ in the past few years.
A. built B. have built
C. have been built D. had been built
在线课程【答案】A
【解析】
试题分析：考查时态和语态。根据句中的时间状语词in the past few years可知用现在完成时。主语subway lines与build为被动关系，故用被动语态。句意：在先进技术的帮助之下，在过去的几年，许多新的地铁线已经被建。故A正确。