I know it’s normal for such a thing to happen，but we________it if we’d been more careful.
| A．need have avoided | B．could have avoided |
| C．will have avoided | D．had avoided |
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I know it’s normal for such a thing to happen，but we________it if we’d been more careful.
| A．need have avoided | B．could have avoided |
| C．will have avoided | D．had avoided |
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