Previous studies provoked ______ because they used patients whose diagnosis was questionable.

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问题 Previous studies provoked ______ because they used patients whose diagnosis was questionable.

选项 A、contribution
B、contraction
C、controversy
D、convergence

答案C

解析名词词义辨析。contribution“贡献，捐款”；contraction“缩减；订约”；controversy“公开辩论，论战”；convergence“收敛，集合”。根据句意，能与provoked搭配的名词只能是controversy，意为“引起公开辩论”。故答案为C。

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