单选题:TheideA.ofmakingsuchA.clockwasdevelopeD.byA.groupof

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题目内容:
TheideA.ofmakingsuchA.clockwasdevelopeD.byA.groupof A.studentsatBrownUniversit
B.teachersatBrownUniversit
C.sleep-deprived scientist
D.formerengineersatAxonSleepResearchLaboratorie
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