答案B
be surprised
be surprised at 都是人做主语哦··
如：I was surprised to see Matt at the door .我开门看见马特站在门边,有几分惊讶.
I was surprised at the news about his death .他去世的消息令我感到震惊.
所以只能选B
指：实验让学生很惊奇
A的话好歹也该给加个s