同学,很高兴回答你的问题
正确答案：填were surprised 或 felt surprised
即：They ( were ) ( surprised ) when they heard the news.
或 They ( felt ) ( surprised ) when they heard the news.
翻译：听到这个消息时,他们感到很惊奇.
解析：surprised 感到惊奇的,形容人感到惊讶,修饰人；而surprising 是修饰物的,形容某物令人惊讶的,如
He was surprised at this surprising news.
他对这个令人惊讶的消息感到很惊讶.
有不明白的请继续追问,