He made up his mind to devote his life the river polluted.
| A．to prevent, to be | B．to prevent, from being |
| C．to preventing, to be | D．to preventing, from being |
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He made up his mind to devote his life the river polluted.
| A．to prevent, to be | B．to prevent, from being |
| C．to preventing, to be | D．to preventing, from being |
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