limit in 和limit to有什么区别

题目

limit in 和limit to有什么区别
有道完型填空:
She has limited herself__ three children - one below the national average of four.
我选了in,答案给的to.
请达人指点.

答案

limit in 不存在这样的搭配.
limit to 固定搭配,意为限于.如：There is a limit to what one can bear. 人的忍耐肯定是有限度的.