都说是be surprised at,但初一教科书上是be surprised如：I am surprised they can play in this heat
问题描述：
都说是be surprised at,但初一教科书上是be surprised
如：I am surprised they can play in this heat
答
be surprised at ,at是介词,后面跟名词,代词,动名词,例句中是be surprised 后跟that从句的结构,只是省略了that.也就是说前一个结构跟短语,后一个短语跟整个句子,这样的用法跟make sure of sth和make sure that的用法一样.