题干
------ What happened to you yesterday evening? Why didn’t you finish your work?
------____ the lights off, we could not continue our work. As a result, we had to leave.
------____ the lights off, we could not continue our work. As a result, we had to leave.
A：Until
B：Because
C：With
D：A
答案(点此获取答案解析）
C
