until 用在否定句 要翻成 直到...才開始,用在肯定句要翻成 直到...才結束,所以這題如果用until會變成我一直在打掃直到客人都走了才結束。
補充
Not until I grew up _____ how much my parents loved me.(直到我長大了,我才明白我的父母有多愛我。)(A) I understood (B) did I understand
答 :B
This ticket is valid until December.字面上意思為「這張票一直有效、一直有效,直到十二月」,那其實就是「這張票直到十二月都有效。」
________ all the guests left, I cleaned ..-阿摩線上測驗