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The secretary worked late into the night, ________ a long speech for the president.

A.to prepareB.preparing
C.preparedD.was preparing

B

解析试题分析:句意:秘书一直忙到深夜在为总统准备一份很长的演讲稿。现在分词表主动,过去分词表被动。现在分词作伴随状语时,表示分词的动作和句子谓语的动作几乎是同时发生的。动词不定式一般做目的状语,表示的是动作将要发生。从本题中看,work 和prepare这里两个动作是同时发生的,故此处用现在分词作伴随状语。由句意可知选B。
考点: 考查非谓语动词的用法。

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