we will have to wait for another three days-----they are well prepared for the meeting?

题目

we will have to wait for another three days-----they are well prepared for the meeting?
A until B before C after D since
The answer given is B.I want to know if A will do

答案

B 句子意思为“在他们准备好开会之前我们将不得不再等三天”
而until 意思是“直到...才” 这里句意不通
let's wait until the rain stops 咱们等雨停了吧
英语单选选的是最佳选项而不是正确选项