It's [ ](乐趣)to play sports with old friends

问题描述:

It's [ ](乐趣)to play sports with old friends

funny 因为be动词后用 形容词

It's [ interesting](乐趣)to play sports with old friends

interesting
这句话的形式主语it 指代的是 to play sports with old friends这一行为 因此要用interesting