His father stopped smoking.= His father gave up smoking请问怎么填. 上边句子 = His father__ __smoke.= His father__ __smoked.
问题描述：
His father stopped smoking.= His father gave up smoking
请问怎么填. 上边句子 = His father__ __smoke.= His father__ __smoked.
答
His father (used) (to) smoke. = His father (has) (previously) smoked.