WiththefastdevelopmentofcomputerandInternettechnologie...

問題詳情：

 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

【回答】

C

知識點：現在進行時及其被動式

題型：選擇題