be surprised后可直接加动名词吗

1.Be surprised at 后面可以加 动名词,名词,名词短语等,因为at 是介词,be surprised at 是一个短语
2.be surprised that 只能跟一个完整的句子,这是一个表语从句
be surprised at sth对……感到很惊奇
He is surprised at dragons.
be surprised to do sth 惊奇地做某事
She was surprised to find she was lost.