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you should open the window to let in the clean air.let in

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you should open the window to let in the clean air.let in
是的,是固定用法
let in sth.容许; 加进; 让…进入;
如:A tiny opening will let in a gust of wind.
针尖大的洞,也会刮进斗大的风.
句意:你应该把窗子打开,让清新的空气进来.
再问: parents usually let their children choose their own job.这句中choose前是不是省略了to .也是固定用法吗?就像make sb do sth.
再答: 是的,let sb. do sth. 是固定用法