◎ 题干
– I’m sorry I stepped on your toe; it was an accident.
– It wasn’t! You did it ______.
A.by accidentB.at present
C.on purposeD.at dusk
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“– I’m sorry I stepped on your toe; it was an accident. – It wasn’t! You did it ______.A.by accidentB.at presentC.on purposeD.at dusk…”主要考查了你对  【序数词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。