他们对我们保密他们的计划。

They kept us ___in ___the ___dark about their plans.

彼得一直对她隐瞒他们争吵的原因。

Peter had always kept her ___in ___the ___dark about the reason for their fight.

管理层让员工对即将到来的变化一无所知。

The management left the employees ___in ___the ___dark regarding the upcoming changes.