zuì hǎo shuō qīng chǔ nǎ jiàn shì, bù hǎo yì si, wǒ gāng cái dǎ duàn nǐ le

最好说清楚哪件事：“不好意思，我刚才打断你了。

It's best to specify which matter: 'Sorry, I just interrupted you.'