Helen was much kinder to her youngest child than she was to the others of course made the

问题补充：

Helen was much kinder to her youngest child than she was to the others，，of course，made the others jealous．

A. who

B. that

C. which

D. what

答案：

A. who

B. that

(答案→)C. which

D. what

解析：

试题分析:句意：海伦对她最小的孩子比别的孩子好，当然这使得其他孩子很嫉妒。分析结构可知此处是非限制性定语从句，排除BD选项，从句中缺少主语，指代前句话的内容，故答案选C。