Last summer I had an opportunity to volunteer at the local hospital,中volunteer 是动词还是名词?

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• Last summer I had an opportunity to volunteer at the local hospital,中volunteer 是动词还是名词?
• Last month i had an opportunity ____ at the local hospital.为什么上空填的是Last month i had an opportunity ____ at the local hospital.为什么上空填的是volunteering,而不用to volunteer不要复制粘贴,百度上的我都看过了
• Last summer I had an opportunity to volunteer at the local hospital,中volunteer 是动词还是名词?
• have an opportunity to do与doing的区别?Last month i had an opportunity ____ at the local hospital.为什么上空填的是volunteering,而不用to volunteer
• 英语翻译
• last night i had an opportunity ( ) at the hospital