Used he to smoke 这里把Used 提前,为何不用Do

Used he to smoke 这里把Used 提前,为何不用Do I used to smoke中smoke怎么不用smoked? 有没有 Used he to smoke? you used to smoke,___you? my father used to smoke与used smoke的区别? used to do used to doing be used to do Be used to do sth Be used to doing sth 后者的to为何做介词? he ____ smoke when he was very young.A.used to B.likes to C. My parents used to smoke after meal. 翻译used to do used to doing 英语used to do used to do sth.