单选题
Sara 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
【正确答案】
D
【答案解析】
[解析] 考查关系代词。非限定性定语从句，不能用that，what引导，句中的非限定性定语从句修饰的是前面一句话，也不能用who来引导。
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