Mary often goes swimming with her friends ______ Friday evening.A)for B)at C)in D)on

Mary often goes swimming with her friends ______ Friday evening.A)for B)at C)in D)on

on
有日期的evening多用on

on

在具体日期前必须要用介词on才行，例如“星期五下午”、“7月4号晚上”等，都是如此。