Question

My hair is longer than Tom.（改错）

Answer 1

答案是：

比较的对象是头发 ，因此应该改为：

my hair is longer than Tom's 意思是：我的头发比汤姆的长

~手工翻译，尊重劳动，欢迎提问，感谢采纳！~

Answer 2

Tom 改为 Tom's (Tom 的)
My hair is longer than Tom's.

Answer 3

没错My hair is longer than Tom