After several days of social activities，I decided to ________on my research on the human behaviors.[ ]A．fixB．settleC．setD．concentrate-高中英语-n多题

◎ 题干

After several days of social activities，I decided to ________on my research on the human behaviors.

[ ]

A．fix
B．settle
C．set
D．concentrate

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◎ 解析

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◎ 知识点

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