Question

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？

Answer 1

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。。

Answer 2

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

Answer 3

wait for doing sth

Answer 4

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。