25. Welcome to the Historical Museum, everyone! This stone knife _______ in South Africa and experts can’t be exactly sure about its use.
| A．had been found | B．was found | C．has been found | D．would be found |
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25. Welcome to the Historical Museum, everyone! This stone knife _______ in South Africa and experts can’t be exactly sure about its use.
| A．had been found | B．was found | C．has been found | D．would be found |
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