confused在此为形容词，形容词作表语，后接不定式作形容词补足语，表示导致confused这种状态的原因。虽然词典没有confused后接不定式的例句，但COCA语料库却有类似用法。以下为部分例句。

He waved but the two passengers seemed confused to see him and consulted with each other.

Insiders at the event were confused to see the nanny with Affleck but without his kids.

Daria was surprised and confused to find herself feeling pity for them.

They will be confused to find the data and the latest information about art.

Many people would be confused to read about the benefits of ethical hacking.

I was confused to hear that there were any " stars " at all in our department, though apparently my own independent study mentor Prof. Meyers was one of them.

I was confused to find that the actress who was Jan Brady now played a hooker in a short fur coat.

Her sheep are confused to be here.

He must be confused to call you " Papa "!

I am ambivalent and confused to tell you the truth.