— What did you do yesterday?

— We had great fun            in the park. [ ]

A. plays

B. played

C. playing

D. to play

规定“私营经济是社会主义公有制经济的补充”，是在对我国现行宪法进行()修正时作出的。

A．第一次

B．第二次

C．第三次

D．第四次