man escaped from the prison last night.It was a long time __

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man escaped from the prison last night.It was a long time ________ the guards discovered.
A man escaped from the prison last night.It was a long time ________ the guards discovered what had happened.A.beforeB.untilC.sinceD.when
我手上的答案是选A,before,不知道为什么要选A,就查看了一下百度,有解释说是根据句子的意思,有解释是说IT'S 时间 before 句型,
更离奇的是我发现还有选C的.而且貌似C的解释更加现实,他们的解释是因为后面是 what had ,所以用过去完成时,
请问这题究竟要选什么,请不要复制别人答案呢,因为我都基本上看过了~

就选A 这就是it is a long time before的用法.即在狱卒发现了发生了什么之前他逃了.后面的had happened 与前面的选项无关,是和“discovered”连用的毕竟发生的事在发现之前,发现用一般过去时,发生就用过去完成时.

man escaped from the prison last night.It was a long time __ 41.The robber escaped from the prison last night.The police_ 继续提问：The robber escaped from the prison last night.the polic 1.They escaped from the prison last week. The store was broken into last night.It was a long time____t It was last night ___ I see the comet.A.the time B.when C.th Last night we had a good time at the __ there was a heavy storm last night.=it __ __last night When ___ where he was at the crime time last night, the man It has been a long time __ after ___I saw you last time.不过我总英语翻译Last night,I drank and cried ,it was the last time.I wil 高考英语单选John was so excited that night that it was a long time