It's been a happy place to be.
be 可以表示“居住;待在;去”(live, stay, go)之意,在本句作后置定语。
It's been a happy place to be. =It's been a happy place to live/stay.
又如:
Our dressing room was a happy place to be.
我们的更衣室成了欢乐的海洋。
I am enjoying the club because it is a happy place to be.
我很喜欢俱乐部,因为呆在这里很开心。
At that time London was the place to be.
那时候伦敦是不可不去的地方。
《牛津高阶英汉双解词典》
Camden Market is the place to be on a Saturday or Sunday
卡姆登市场是周末的最佳去处。
《柯林斯高阶英汉双解学习词典》
The circus is the place to be this Saturday or Sunday.
马戏团是这周六或周日的最佳去处。
《柯林斯英汉双解大词典》
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