23. Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
| A．to stop | B．to have stopped | C．being stopped | D．stopping |
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23. Mr. Smiths was busy writing a story, only ______ once in a while to smoke a cigarette.
| A．to stop | B．to have stopped | C．being stopped | D．stopping |
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