在我小的时候,我比较喜欢吃快餐 I------- ------- eat fast food when I was yo

I preferred to eat fast food when I was young.
prefer这个字的最后重读音节是属于重读r音节,发卷舌的长元音,所以在变成过去式时要双写字母r再加词尾-ed.
This is a sweater that I bought yesterday.
希望我能帮助你解疑释惑.