问题
选择题
The Ching Ming Festival or Grave-Sweeping Day, ____ falls on April 4 this year, is an important date in the Chinese calendar
A. which B that C. what D. where
答案
A
考查定语从句。从句中缺少主语，所以排除D项，而what不能引导定语从句，that不能引导非限制性定语从句，所以A项正确。
