题目内容

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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