◎ 题干
Dung is kind and helpful, but he is also a little careless _____________.
A.at timeB.at a timeC.at timesD.once a time
◎ 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“Dung is kind and helpful, but he is also a little careless _____________. A.at timeB.at a timeC.at timesD.once a time…”主要考查了你对  【介词短语】【介词】  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。