1. I am taller than you. are 不要
2. The hat is the cheapest I have seen. 是定语从句 I前面省略引导词 that
3. The hat is the cheapest one of which I have seen. 加介词表示范围
1. I am taller than you. are 不要
2. The hat is the cheapest I have seen. 是定语从句 I前面省略引导词 that
3. The hat is the cheapest one of which I have seen. 加介词表示范围