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

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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
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

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
就是to volunteer,不是volunteering

大哥,ing形式的动词可以用来修饰名词,opportunity是名词,所以用ing形式来修饰,to+do是目的而volunteer如果在to后面也是动词,而且是及物动词后面要跟宾语,而volunteer 后面是at引导的地点状语,所以用volunteer+ing