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
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
B.
用不定式做结果状语,前面用only表示不愿看到的结果。