I didn’t go to bed my sister came back.A. becauseB. untilC. ifD. but

问题补充：

I didn’t go to bed my sister came back.

A. because

B. until

C. if

D. but

答案：

A. because

(答案→)B. until

C. if

D. but

解析：not···until 表示直到···才，为固定搭配，故选B