The woman was-------that her son was also in her city a.surprised at finding b.surprised to find我想请问下为什么a不可以呢····

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The woman was-------that her son was also in her city a.surprised at finding b.surprised to find
我想请问下为什么a不可以呢····

at是介词后面不能接that从句

B , be surprised to do sth
be surprised at sth

be surprised at doing sth,意思是对某人的行为/某事很惊讶。
be surprised to do /doing sth:对干某事感到很惊讶
这里的意思是说女人发现她的儿子也在这个城市感到很惊讶。