关于since和before的用法.Jerry has been in the school library for two years ______he left school.A.before B when C since D as soon as

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关于since和before的用法.Jerry has been in the school library for two years ______he left school.A.before B when C since D as soon as
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关于since和before的用法.Jerry has been in the school library for two years ______he left school.A.before B when C since D as soon as
关于since和before的用法.
Jerry has been in the school library for two years ______he left school.A.before B when C since D as soon as

关于since和before的用法.Jerry has been in the school library for two years ______he left school.A.before B when C since D as soon as
c before的话就是过去完成时.过去完成时就是过去的过去

since 时态对比 自从他毕业以后,在图书馆工作两年了 如果用before 那前面的has 应该是had