More than 10,000 relics, ____ between 5,000 to 3,000 BC, ____ at Sanxingdui sinc

题干

More than 10,000 relics, ____ between 5,000 to 3,000 BC, ____ at Sanxingdui since it was first discovered.

A．dating back to, was dug up	B．dating back to, have been dug up
C．dated back to, has been dug up	D．dated back to, were dug up

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