as it’s reported,it is more than 150 years--big beb,a famous

as it's reported,it is more than 150 years__big beb,a famous attraction in london,wa founded.
为什么填 since

As it's reported,it is more than 150 years_since_Big Ben,a famous attraction in London,was founded.
据报道,伦敦的一处著名景点,大本钟始建于150多年前.
since:自.以来.所以直译是,据报道,自伦敦著名景点大本钟建成以来,已经过了150多年.
注：since通常是与现在完成时连用的.
所以原句应该是这样的：
As it is reported,it has been more than 150 years _since_Big Ben,a famous attraction in London ,was founded.
据报道,自伦敦著名景点大本钟建成以来,已经过了150多年.
仅供参考.

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