on the world heritage list,a____ there are about 900 world heritage sites.

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on the world heritage list,a____ there are about 900 world heritage sites.

on the world heritage list,a____ there are about 900 world heritage sites.
on the world heritage list,a____ there are about 900 world heritage sites.

on the world heritage list,a____ there are about 900 world heritage sites.
already已经 怎么样呢?因为也不太了解上下文.
欢迎讨论.