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

发布时间：2020-08-17 15:05:23

If you want to see a doctor,you fix a date with him ahead of time.That is a mon      in the USA.
A.sense          B.practice              C.rule            D.reality

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解析：a mon practice惯例。
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