有关高中英语The secretary worked late into the night,( )a long speech for the president.A.to prepareB.preparingC.preparedD.was preparing答案为B,为什么不把它当作原因状语从句选C?

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有关高中英语The secretary worked late into the night,(  )a long speech for the president.A.to prepareB.preparingC.preparedD.was preparing答案为B,为什么不把它当作原因状语从句选C?

有关高中英语The secretary worked late into the night,( )a long speech for the president.A.to prepareB.preparingC.preparedD.was preparing答案为B,为什么不把它当作原因状语从句选C?
有关高中英语
The secretary worked late into the night,( )a long speech for the president.
A.to prepare
B.preparing
C.prepared
D.was preparing
答案为B,为什么不把它当作原因状语从句选C?

有关高中英语The secretary worked late into the night,( )a long speech for the president.A.to prepareB.preparingC.preparedD.was preparing答案为B,为什么不把它当作原因状语从句选C?
B.preparing
伴随状语必须用进行时态
C.prepared 绝对错误