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题库 / Prep2007E1-SC-158
The largest trade-book publisher in the United States has announced the creation of a new digital imprint division, under which it will publish about 20 purely digital works to be sold online as either electronic books or downloadable copies that can be printed upon purchase.
works to be sold online as either electronic books or
works to sell them online, either as electronic books or
works and it will sell them online as either electronic books or as
works, and selling them online as either electronic books or as
works, and it will sell them online either as electronic books or
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B, The publisher will publish 20 books to sell them online 句子结构是错的，逻辑主语是it，没问题；但to sell them作伴随状语修饰publish是不恰当的，因为用to意味着主句谓语动词引起了不定式的动作状态的改变，即出版这个动作导致sell状态的出现，但实际上出版时出版，卖是卖，我出版了也可以自己留着纪念或送人，不卖。所以不能做伴随状语
它也不能做定语修饰books，books不能sell books
所以sell要么是和publish并列，publish 20 books and sell them online, 要么作定语修饰books，publish books to be sold online。作定语时可否用不定式要看主语对该动作的控制力，books to be sold，主语是人，人可以决定sell还是不sell，所以用不定式。
the construction 'to be sold' is passive voice. in fact, the passive voice is necessary here, because you don't know who is going to be selling the books.
(compare the analogous sentence 'there is still plenty of food left to be eaten').
此题用either or 平行考点即可排除BCDE！
AE区别：
B，to sell them 是books的定语，但是books不能主动卖，是被卖
C, ethier or的平行结构不对
D. and 前后不平行
E，逗号直接让前后两句话并列，并列级别不对
B,C,D通过parallelism排除，E选项连词会导致句子割裂