October 1 1949 is the day the People’s Republic of China was founded.A. whereB. thatC. whi

问题补充：

October 1,1949 is the day the People’s Republic of China was founded.

A. where

B. that

C. which

D. when

答案：

A. where

B. that

C. which

(答案→)D. when

解析：这题考查定语从句，先行词是the day，而且定语从句不缺主宾表，填when，句意是：1949年10月1号是中华人民共和国成立的日子。选D。