阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中选出可以填入空白处的最佳选项。
Sometimes I really doubt whether there is love between my parents. They are very busy working to 21 the family. They don’t act in the 22 ways that I read in books or I see on TV. 23 flowers to each other on Valentine’s Day is even more 24 .
One day, my mother was sewing a quilt(床罩). I 25 sat down beside her and looked at her. “Mom, is there love between you and Dad?” I asked her in a 26 voice.
My mother stopped and raised her head with 27 in her eyes. She didn’t answer immediately. Then she 28 her head and continued to sew the quilt. At last my mother said:
