Nearly a century later，extensive observations_______that elephants indeed remember injuries and hold hates against their abusers．
| A．confirmed | B．have confirmed |
| C．will confirm | D．had confirmed |
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Nearly a century later，extensive observations_______that elephants indeed remember injuries and hold hates against their abusers．
| A．confirmed | B．have confirmed |
| C．will confirm | D．had confirmed |
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