Boys and girls did you enjoy in the park yesterday?A. youB. yoursC. yourselfD. yourselve

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。