Discovery in a South African cave suggests that modern human behavior ____ much earlierthan ____.
| A．begin, previously thought | B．began, previously thought |
| C．should begin, previous thinking | D．began, previous thinking |
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Discovery in a South African cave suggests that modern human behavior ____ much earlierthan ____.
| A．begin, previously thought | B．began, previously thought |
| C．should begin, previous thinking | D．began, previous thinking |
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