tā duì wǒ de huí dá gǎn dào hěn yà yì，yīn wèi tā yuán běn yǐ wéi wǒ huì jù jué。

他对我的回答感到很讶异，因为他原本以为我会拒绝。

He was very surprised by my answer, as he had originally thought I would refuse.