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一道英语选择题,关于waitforIhadbeensittinginmyseatforatleasttwohours,waiting()为什么是选forthetrainstarting,不选forthetraintostart?

题目详情
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?
▼优质解答
答案和解析
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.