Parapsychology, which a very controversial field is, has attracted a relatively

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问题 Parapsychology, which a very controversial field is, has attracted a relatively small number of scientists.

选项 A、is a very controversial field
B、what a very controversial field is
C、a very controversial field
D、a field very controversial which

答案 C

解析句意：超心理学是一个非常有争议的领域，它只吸引了相对较少的科学家。同位语对其同位成分进行补充解释时前后用逗号隔开，所以选项C为答案。

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