题目内容:
_______ he was out of the room , he turned back and knocked at the teacher’s door again.
A.Before
B.Since
C.As soon as
D.Until
参考答案:【答案仅供学习,请勿对照自行用药等】
_______ he was out of the room , he turned back and knocked at the teacher’s door again.
A.Before
B.Since
C.As soon as
D.Until