___(be) a volunteer in a hospital is great.

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___(be)avolunteerinahospitalisgreat.___(be)avolunteerinahospitalisgreat.___(be)avolunteerinahospital

___(be) a volunteer in a hospital is great.
___(be) a volunteer in a hospital is great.

___(be) a volunteer in a hospital is great.
To be 或者 Being

To be

Being动名词作主语

Being