Helen was much kinder to her youngest son than to the others, , of course, made
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Helen was much kinder to her youngest son than to the others, ________, of course, made the others envy him．
[]A．who
B．that
C．what
D．which
试题答案
答案：D
解析：考查关系代词which引导的非限制性定语从句。关系代词which引导的定语从句，修饰说明前面的主句，which在定语从句中作主语。