The animals you eat had to spend their lives_crowded /crowding__ together in tiny spaces .

题目

The animals you eat had to spend their lives_crowded /crowding__ together in tiny spaces .
我知道答案是crowded,也能理解,不必讲它为什么对啦~
但是我觉得crowding也可以的.就是“spend.doing.”.的结构,然后“crowd做不及物动词使用”,请问这种用法有什么不对的呀?

答案