Question

【题目】---Excuse me, is Mr. Green in his office?

---Yes, but he’s talking to a teacher. You’d better wait __________ he finishes his talk.

A. whenB. whileC. untilD. since

Answer 1

【答案】C

【解析】

句意：—打扰一下，格林先生在他的办公室吗？—是的，但是他现在正在和一位老师谈话。你最好等一下，直到他完成谈话。A. when当…时候；B. while当...时候；C. until直到；D. since自从。根据本题语境可知，是一直等到他谈话结束，故选C。