May the fourth is the day we Chinese people will never forget. A. whichB. whenC. on which

问题补充：

May the fourth is the day we Chinese people will never forget.

A. which

B. when

C. on which

D. why

答案：

(答案→)A. which

B. when

C. on which

D. why

解析：句意：我们中国人永远也不会忘记五月四日这一天。定语从句中，forget后缺少宾语which充当它的宾语。故选A.