题文
_____ to his research work, the professor cared little about any other things.
| A．Devoting |
| B．Devoted |
| C．Having devoted |
| D．To devote |
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_____ to his research work, the professor cared little about any other things.
| A．Devoting |
| B．Devoted |
| C．Having devoted |
| D．To devote |
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