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

解析本题句意：这项研究基于研究者花费五年时间收集的数据。be based on sth．基于……。介词+which引导定语从句。故选D。

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