题目内容：

是it's necessary for us to sleep for 8 hours 还是is' necessary for us to sleep 8 hours?

优质解答

为您
应该是it's necessary for us to sleep for 8 hours ,因为固定句型是：lt's nessery for sb to do sth,表示做某事对某人来说很重要.
翻译：让我们睡8小时的觉是十分必要的.
望采纳!谢谢.