一道英语选择题,关于wait forI had been sitting in my seat for at least two hours,waiting()为什么是选for the train starting,不选for the train to start?

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一道英语选择题,关于wait forI had been sitting in my seat for at least two hours,waiting()为什么是选for the train starting,不选for the train to start?
一道英语选择题,关于wait for
I had been sitting in my seat for at least two hours,waiting()
为什么是选for the train starting,不选for the train to start?

一道英语选择题,关于wait forI had been sitting in my seat for at least two hours,waiting()为什么是选for the train starting,不选for the train to start?
个人认为是 wait for the train to start啊
来源:牛津高阶 第8版
wait for somebody/something to do something We're waiting for the rain to stop before we go out.
wait for the train starting没听过.

wait for doing sth

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14. I had been sitting in my seat for at least two hours, waiting ________.
A) the train to start C) for the train to start
B) for the train starting D) for the train start
14.C
答案有误。