Jack took part in the speech contest and, ______ is more surprising, won the first place.
A.that
B.what
C.which
D.it
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C解析这题考查非限制性定语从句，非限制性定语从句也是插入语，去掉后这句话是：Jack took part in the speech contest and won the first place.是个完整的句子，which指代的是won the first place.选C。