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l used to smoke.(改否定句) l ____ ____to smoke.l used to smoke.(改否定句)l ____ ____to smoke.

题目详情
l used to smoke.(改否定句) l ____ ____to smoke.
l used to smoke.(改否定句)
l ____ ____to smoke.
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答案和解析
used not
used to do sth.的否定形式是used not to do sth.