◎ 题干
If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.
A. habit      B. law        C. rule        D. custom
◎ 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“ If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.A. habitB. lawC. ruleD. custom…”主要考查了你对  【可数名词及其单复数】【集合名词】【名词】  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。