英语语法问题:His parents are surprised ( ) his progress.括号里应填哪个介词?to还是at?为什么另

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英语语法问题:His parents are surprised ( ) his progress.括号里应填哪个介词?to还是at?为什么另
英语语法问题:His parents are surprised ( ) his progress.括号里应填哪个介词?to还是at?为什么另一个不行?请详细说明一下,谢谢!~

答案是at,一般词组为 sb.be surprised at sth,某人对某事赶到惊讶,或者 sb.be suprised to do sth (这里的to是不定式,而不是介词)