If you want to see a doctor, fix the date with him ahead of time. This is a common in th

发布时间：2020-08-17 15:13:08

If you want to see a doctor, fix the date with him ahead of time. This is a mon      in the USA.
A. habit      B. law        C. rule        D. custom

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解析：本题是典型的词语辨析题，habit通常为“生活习惯”，law为“法律”，rule为“条文规定”，custom为“习惯”，所以D项符合题意。   
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