be in on

be party to be fully involved in参与;完全卷入

He is in on the whole sordid business.他参与了整个这场肮脏的勾当。

They were de finitely in on the consiracy.他们肯定完全参与了这一阴谋。

I'm sure she's in on their plans.我肯定她跟他们同谋。


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