Students in the football class usually play football when school is over.A. theB. /C. aD.

问题补充：

Students in the football class usually play football when school is over.

A. the

B. /

C. a

D. an

答案：

A. the

(答案→)B. /

C. a

D. an

解析：句意：放学的时候足球班的学生们通常踢足球。play 与球类连接之间不加任何冠词，故选B。