29. He was busy preparing a speech , only _______ once in a while to rise from the table for a tea .
| A．stopping | B．to stop | C．to have stopped | D．having stopped |
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29. He was busy preparing a speech , only _______ once in a while to rise from the table for a tea .
| A．stopping | B．to stop | C．to have stopped | D．having stopped |
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