题文
We suggest that they provide an effective warning system to ________ many of the disasters ________.
| A．keep; happening |
| B．prevent; from happening |
| C．stop; from being happened |
| D．prevent; from being happened |
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We suggest that they provide an effective warning system to ________ many of the disasters ________.
| A．keep; happening |
| B．prevent; from happening |
| C．stop; from being happened |
| D．prevent; from being happened |
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