◎ 题干
--- Have you solved your problem?
---I've kept on thinking about that matter ______, but I have no idea yet now.
A.at timesB.some timeC.at a timeD.all the 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“ --- Have you solved your problem?---I've kept on thinking about that matter ______, but I have no idea yet now. A.at timesB.some timeC.at a timeD.all the tim…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  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。