There is a limit __________ people's life, but no limit __________ the knowledge.
| A．on; to learn |
| B．to; to learn |
| C．on; learning |
| D．to; to learning |
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There is a limit __________ people's life, but no limit __________ the knowledge.
| A．on; to learn |
| B．to; to learn |
| C．on; learning |
| D．to; to learning |
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