be surprised at /to
be surprised at somebody/something/doing something對某人的行為/某事/干謀事感到驚訝
I am surprised at you.我對你的行為跟到驚訝.
I was surprised at your tone.我對你的腔調(diào)吃驚不小.
I was surprised at seeing/to see him there.我真想不到在那里見到他.
be surprised to do something對干某事感到很驚訝
I'm surprised to hear you say that.我真想不到聽到你說出這番話來.
可以看出,be surprised to do something跟be surprised at doing something意思一樣.