问题
选择题
With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.
A．are challenged
B．have challenged
C．are being challenged
D．have been challenged
答案
答案：C
考察时态和语态。根据句意可知本题应该使用被动语态，排除B项。根据句意可知传统的印刷书本正受到电子书的挑战。