With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books.
A．a(chǎn)re challengedB．have challenged
C．a(chǎn)re being challengedD．have been challenged
C
考察時(shí)態(tài)和語態(tài)。根據(jù)句意可知本題應(yīng)該使用被動語態(tài)，排除B項(xiàng)。根據(jù)句意可知傳統(tǒng)的印刷書本正受到電子書的挑戰(zhàn)。
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