The patients will have to wait all day___the doctors work fa

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The patients will have to wait all day___the doctors work faster.
A.until
B.unless
为什么选A

选两个都可以,表达不同的意思.
选A：病人要整天等候,直到医生工作速度加快.（等的动作持续到医生加快速度结束.unless =if not）
选B：如果医生不加快速度,病人要整天等候了.
如果是我会选后者,这个更通顺.
楼上两位说unless 与not连用,不对.举个例子就看出来了:
You'll miss the train unless you hurry up.=You'll miss the train if you don't hurry up.

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