If human beings had been a bit less greedy and cruel, more birds and animals dying out.
| A．ought to avoid | B．could have been avoided |
| C．should have avoided | D．might have avoided |
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If human beings had been a bit less greedy and cruel, more birds and animals dying out.
| A．ought to avoid | B．could have been avoided |
| C．should have avoided | D．might have avoided |
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