If these measures can’t help ______such a tragedy from happening again, what’s the sense of taking them?
| A．prevented |
| B．being prevented |
| C．preventing |
| D．to prevent |
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If these measures can’t help ______such a tragedy from happening again, what’s the sense of taking them?
| A．prevented |
| B．being prevented |
| C．preventing |
| D．to prevent |
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