if you want to see a doctor,you fix a date with him ahead of time_英语解答

if you want to see a doctor,you fix a date with him ahead of time.that ie a common__in the usa
a,method.b,rule.c,practice.d,habit

人气：171 ℃　时间：2020-03-18 07:21:12

解答

c
翻译：如果你要看病的话,要和大夫提前预定日期,这在美国是个惯例
common practice 固定搭配,惯例