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

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

选项 A、to prepare
B、preparing
C、prepared
D、was preparing

答案B

解析 此处没有连词,不能选D,否则出现了两个谓语动词worked和was preparing。只能在B或C中选一个。又因前后两个动作同时发生,且与主语为主动关系,故应用现在分词。
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