Researchers have spent five years collecting data______the study was based.A、on

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问题 Researchers have spent five years collecting data______the study was based.

选项 A、on that
B、in which
C、in that
D、on which

答案 D

解析本题考查定语从句。句意：研究人员花了5年时间收集研究的数据。定语从句中连接词前若有介词，则连接词不能用that，因此排除选项A和C。选项中的介词和be based形成固定搭配，be based on为固定搭配，意为“根据，基于”，故本题选D。

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