How to say to find an excuse in Chinese 借故

他不愿意谈自己的看法，借故先走了。 ( He didn't want to talk about his own views, so he left first. )

会没开完，他就借故溜号儿了。 ( He didn't finish the meeting, so he slipped away. )

此事已晓谕再三，不得借故推诿。 ( This matter has been known again and again, and should not be excused. )