he left the office()once,as soon as he heard ()the accident.括号里填什么?

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he left the office()once,as soon as he heard ()the accident.括号里填什么?

he left the office()once,as soon as he heard ()the accident.括号里填什么?
he left the office()once,as soon as he heard ()the accident.括号里填什么?

he left the office()once,as soon as he heard ()the accident.括号里填什么?
答案是
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