Children had a good time in Chibi Park on May Day.A. enjoyed themselvesB. helped themselve

问题补充：

Children had a good time in Chibi Park on May Day.

A. enjoyed themselves

B. helped themselves

C. hurt themselves

D. hid themselves

答案：

(答案→)A. enjoyed themselves

B. helped themselves

C. hurt themselves

D. hid themselves

解析：enjoyed themselves玩得很高兴;helped themselves自助;hurt themselves伤到自己;hid themselves隐藏自己.句意:五月一日,孩子们在赤壁公园玩得很高兴.结合语境可知选A.