应该是be surprised to do,同义词组：be amazed at 对……感到惊讶

1.be surprised to do 释义：惊讶于……

例句：She is surprised to find the front gate is open.

她很惊讶的发现前门是开着的。

He is surprised to find his room thoroughly clean.

他惊讶得发现他的房间给彻底地打扫了。