题目

---Have you got your new job yet, Bob? ---Kind of. But the interviewer said they needed a reference from my former employer _____ they could give me a definite offer. A. until           B. when             C. once              D. before   答案： D   考查状语从句中连词的选择。根据题意可知，before符合语境，即他们在给我一个肯定的答复之前，需要从我以前的老板那里了解一些情况。其它几项不合语境。  

查看本题答案和解析