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问题: The secretary worked late.......

The secretary worked late into the night, ___a long speech for the president.
A. to prepare  B. preparing  C. prepared  D. was preparing 劳烦大家选择并解析为什么不选 A,还有翻译。谢谢!!!

解答:

选B,作非谓,doing的形式在这里作原因状语。若选A,to相当于in order to,直接用,不用前面加逗号。
译:秘书工作到很晚,因为他要为主席准备一个很长的演讲。