If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.(本题2.5分) A、 habit B、 law C、 rule D、 custom

If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.(本题2.5分)
A、 habit
B、 law
C、 rule
D、 custom

出自：西安石油大学大学英语I（下）

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