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After several days of social activities, I decided to       _ on my research on the human behaviors. 
A.fixB.settleC.setD.concentrate
D
考查词义辨析。fix 安装,settle 定居,set 创立,concentrate 专注,句意:几天的社交活动之后,我决定全神贯注于关于人类行为的研究。所以选D。
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