Children had a good time in Chibi Park on May Day.
A. enjoyed themselves
B. helped themselves
C. hurt themselves
D. hid themselves
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(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.