i don't know what made him laugh so ei don't know what made him laugh so ______(excite)原因

i don't know what made him laugh so ei don't know what made him laugh so ______(excite)原因
i don't know what made him laugh so e
i don't know what made him laugh so ______(excite)
原因

i don't know what made him laugh so ei don't know what made him laugh so ______(excite)原因
excited
形容词作状语

excited
excited表示因为某事，某人而激动
exciting表示某事，某人本身是激动的