of all people/things/places idiom
（表示认为不可能或惊讶）在所有的人／东西／地方中（偏偏）
used to express the idea that a particular person/thing/place is unlikely or surprising
Donna, of all people, is the last one I'd expect to see at the gym. 我万万没有想到会在健身房里见到当娜。
And why did you choose Iceland for a holiday, of all places? 那么多的地方，你为什么偏偏要去冰岛度假？