◎ 题干
With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.
A.are challengedB.have challenged
C.are being challengedD.have been challenged
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.A.are c…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。