要表达“我知道了”，你的第一反应是不是“I know”？比如下面这些场景：“Take your umbrella. It’s raining.”“I know!”“The bus is coming!”“I know!
B: Yeah， it's about time.是的，早就该找到了。常用句子结构:It's about time ...例:It's about time the school improved its food service.
