分类：教育/科学-外语学习-英语考试
问题：Itwasnotuntilhelockedthedoor____? 
It was not until he locd the door____he realized he had left the keys inside the house.A,when B,that C,where D,before
回答：It is not until… that…这是一个强调结构
B
直到她锁上门才意识到要是落屋了。