It is believed that on December 21st 1891 the first basketball game in history was play

问题补充：

It is believed that on December 21st, 1891, the first basketball game in history was played．Then in 1936 in Berlin, it became Olympic event.

A. 不填; an

B. a; an

C. the; the

D. 不填; the

答案：

(答案→)A. 不填; an

B. a; an

C. the; the

D. 不填; the

解析：第一空不用冠词，in history是固定用法。第二空用不定冠词表示“一项奥林匹克的比赛项目”。