题目内容
【题目】________back at my middle school years,I regret not having worked so hard as I should have.
A.Looking
B.To look
C.Looked
D.Look
【答案】A
【解析】look back at意为“回顾,回忆”,与主语I之间是主动关系,因此用动词ing形式作状语。句意为:回顾我的中学时代,我为本应该但没有努力学习而后悔。
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