be surprised/astonished后面可以不加介词at吗

问题描述:

be surprised/astonished后面可以不加介词at吗
后面接一个从句时,可以不加at吗

可以啊
eg:You shouldn't be surprised (that) he didn't come.
Don't be surprised if I pretend not to recognise you.
字典上的例子