【单选题】Helen was much kinder to her youngest child than she was to the others, ______ of course, made the others jealous.
A．who
B．what
C．that
D．which
【单选题】Helen was much kinder to her youngest child than she was to the others, ______ of course, made the others jealous.
A．who
B．what
C．that
D．which
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