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【单选题】
Psychologists have been studying the changes people experience when they leave rural areas and move into urban environments.A.
心理学家已经研究人们经历上的变化，特别是当他们离开农村进入城市的时候。
B.
当心理学家离开农村进入城市的时候，他们研究了人们经历上的变化。
C.
心理学家们一直在研究人们在离开农村进入到城市时所经历的变化。
D.
心理学家，从农村到城市，一直在研究人们所经历的各种变化。
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