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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
C
考察時態(tài)和語態(tài)。根據句意可知本題應該使用被動語態(tài)，排除B項。根據句意可知傳統的印刷書本正受到電子書的挑戰(zhàn)。
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