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He was busy writing a story,only ____...
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
人气:339 ℃ 时间:2020-01-06 11:18:05
解答
A、to stop是正确的,用动词不定式补充说明状态>
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