问题
选择题
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
答案
答案：A
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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
答案：A