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 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?

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

........................

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。