用must和括号里的词造句

问题描述:

用must和括号里的词造句
The room looks tidy now.(someone clean it )

Someone has cleaned it
用现在完成时,强调对现在的影响 (looks tidy)看问题::::::must哦Someone must have cleaned it.must + have + 过去分词此结构用以表示对已发生的事作以肯定推测,意为“想必已经”“一定已经”此句意为: “肯定有人打扫过了”