问题补充:
Boys and girls, did you enjoy in the park yesterday?
A. you
B. yours
C. yourself
D. yourselves
答案:
A. you
B. yours
C. yourself
(答案→)D. yourselves
解析:you人称代词主宾格,你,你们; yours名词性物主代词,你们的,你的;yourself反身代词,你自己;yourselves反身代词,你们自己。句意:孩子们,你们昨天在公园玩得高兴吗?enjoy oneself过得快乐。结合语境可知选D。