29. He was busy preparing a speech , only once in a while to rise from the table for a te

发布时间：2020-08-16 06:54:18


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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(答案→)A. stopping
B. to stop
C. to have stopped
D. having stopped
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