D
此题考查定语从句的用法。which引导非限制性定语从句,指代“Helen was much kinder to her youngest son than to the others.”整个句子。which在定语从句中作主语。of course为插入语。
D
此题考查定语从句的用法。which引导非限制性定语从句,指代“Helen was much kinder to her youngest son than to the others.”整个句子。which在定语从句中作主语。of course为插入语。