After several days of social activities, I decided to       _ on my research on the human behaviors. 
A．fixB．settleC．setD．concentrate
D
考查詞義辨析。fix 安裝，settle 定居，set 創(chuàng)立，concentrate 專注，句意：幾天的社交活動(dòng)之后，我決定全神貫注于關(guān)于人類行為的研究。所以選D。
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