单词：be in on
参预
be in on的用法和样例：
例句
- I was in on what you were doing at that time.我已知道你那时所干的事。
- Mike is a nosey chap, he always wants to be in on everything.麦克是一个爱管闲事的家伙，他老是想知道每一件事情。
- I'd like to be in on the scheme.我很想参与这项计画。