before long是个介词短语,在句中作状语,意为“不久以后、很快”,多与将来时或过去时连用;long before是个副词短语,意为“很久以前”,多与完成时连用。如:[文章版权 禁止转载:考试与评价 I� (
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The bridge will be used before long. 桥很快就会投入使用。[文章版权 禁止转载:考试与评价 AyohVJ$?UWh5?jLFroG]
Before long he had to move on. 不久他又得搬迁。[文章版权 禁止转载:考试与评价 Hd|'!6$5p=Bz;-FroG]
I had seen the film long before. 我很久以前就看了这部电影。[文章版权 禁止转载:考试与评价 I_,SOQ*Y$j7328FroG]