It is said that it ___ here since hundreds of years ago Ahas been existed Bhas existed

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It is said that it ___ here since hundreds of years ago Ahas been existed Bhas existed
It is said that it ___ here since hundreds of years ago Ahas been existed Bhas existed

It is said that it ___ here since hundreds of years ago Ahas been existed Bhas existed
B.exist是不及物动词,后面不跟宾语

had been