Sam -----(ask)to clean up his room before he played football ,动词填空请解释一下为什么要用was asked,谢谢

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Sam-----(ask)tocleanuphisroombeforeheplayedfootball,动词填空请解释一下为什么要用wasasked,谢谢Sam-----(ask)tocleanuph

Sam -----(ask)to clean up his room before he played football ,动词填空请解释一下为什么要用was asked,谢谢
Sam -----(ask)to clean up his room before he played football ,动词填空
请解释一下为什么要用was asked,谢谢

Sam -----(ask)to clean up his room before he played football ,动词填空请解释一下为什么要用was asked,谢谢
Was asked 这里表 被动
Sam 被要求到在他去打篮球之前清理好他的房间
括号内是 ask
如果用 asks,asked,is asking 句子不完整,Sam asks/is asking/asked/ (somebody) to clean.缺少somebody..