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It was a long time ______ the guard discovered that a prison

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It was a long time ______ the guard discovered that a prisoner had escaped from the prison
A since
B before
C when
D after
我想问大家为什么不选A、D呢
It was a long time ______ the guard discovered that a prison
这个空填的是和一段时间有关联的词.
a.since错,前年没有完成时.
c.when表示的是时间点,不是时间段
b.d显然排除d.意思不对.
用before表示很久以后才,英译需要换位理解.
每个都解释了