问题
选择题
He was busy writing a story，only _________ once in a while to smoke a cigarette．
A．to stop
B．stopping
C．to have stopped
D．having stopped
答案
答案：B
stop的逻辑主语是he，表示主动关系。
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He was busy writing a story，only _________ once in a while to smoke a cigarette．
A．to stop
B．stopping
C．to have stopped
D．having stopped
答案：B
stop的逻辑主语是he，表示主动关系。