组卷网 > 高中英语综合库 > 短语辨析 > C > concentrate on
题型:单项选择 难度:0.85 引用次数:117 题号:20103834
After Mrs Allison introduced me, nobody except the boy with glasses spoke to me. He asked if he could have my cake at lunch. I tried to_____________ the lessons, but my mind went blank.
A.insist onB.carry onC.rely onD.concentrate on

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