Children, in my opinion, creative ability is unthinkably rich, is seldom taken notice of

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A. which; that
(答案→)B. whose; which
C. which; which
D. whose; that
解析：考查定语从句。本题第一空中使用whose指代先行词children在句中作为creative ability的定语；第二空用which引导非限制性定语从句，指代前面一句话的内容在句中做主语。我们很少注意到，创造力无穷的孩子们在那些方面应该接受训练。故B正确。