• 1. he came here before long: 不久以后他就来到这里

• 1.He came here before long.
  他很早就来到了这儿。
  dict.yoduao.com
• 2.He came here long before.
  他很早就来到了这儿。
  dict.yoduao.com
• 3.How long had Comrade Wu lived in the South before he came here?
  吴同志来这儿前，在南方住了多久？
  dict.yoduao.com

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