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懂英语的来,since untilasafter的区别The firemen arrived half an hour_

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懂英语的来,
since
until
as
after
的区别
The firemen arrived half an hour______the alarm was first raised,when it was too late to save much of the building.
应该填这四个当中的哪一个?
懂英语的来,since untilasafter的区别The firemen arrived half an hour_
since:自从,
until:直到——
as:当或因为
after:之后
例句:
I have lived here since five years ago.
I didn't go until he come back.
He didn't go out as it rained.
He left after she came back.