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Amanescapedfromtheprisonlastnight.Itwasalongtimetheguardsdiscoveredwhathadhappened.A.beforeB.untilC.soD.while这道题给出的答案是A,请问B为什么不对?

题目详情
A man escaped from the prison last night.It was a long time ____ the guards discovered what had happened.
A.before B.until C.so D.while
这道题给出的答案是A,请问B为什么不对?
▼优质解答
答案和解析
这是个固定的搭配