I don't know what made him laugh so ________(excite)?

I don't know what made him laugh so ________(excite)?
I don't know what made him laugh so ________(excite)?

I don't know what made him laugh so ________(excite)?
excited
我不知道是什么让他这么激动.
excited 形容词,表示“自己感到激动的”

I don't know what made him laugh so __excitedly______(excite)

应该是用 excited吧
用来修饰人

excitedly adv. 激动地
副词修饰laugh这个宾语补足语做状语

excitedly
修饰动词laugh，故用副词。

填excited so修饰形容词，而此处形容词又是形容人，所以用ed的形容词