He didn't do his homework until nine o'clock.
直到九点,他才不再做作业.
为什么不是 直到9点,他都没做作业
Until recently,scientists believed that life on other planet was just a hopeful dream.
是直到最近之前，科学家们都相信其他星球有生命仅仅是个充满希望的梦。
为什么不是，直到最近，科学家们才相信其他星球有生命是个梦