AS a result of my laziness,I failed _to finish_ my work in t

AS a result of my laziness,I failed _to finish_ my work in time.
why?

你是想问什么的呢?
再问： 为什么这样填？我填的to finished
再答： 你好，fail后面是没有加to 在加done这种用法的，这里fail to do sth.表示“没有完成”的意思。下面是fail的用法，请仔细看下： fail vi.失败, 不及格, 忘记 vt.使失望, 舍弃, 辜负, 不及格 n.不及格, 不及格者 fail vi., vt.失败；不及格 The teachers failed me on the written composition. 教师们评我的笔头作文不及格。 He failed his English examination. 他的英语考试不及格。 不足；无法做到；（作物）歉收 Last year the crops failed. 去年农作物歉收。 "They fail to recognize that our population is increasing faster than the supply of food, available resources and job opportunities." 他们没有认识到我们人口的增长超过了粮食的供给|资源的开发和就业的机会。 使失望；辜负 His courage failed him in the end. "到最后,他泄气了。" We will never fail to live up to what our parents expect of us. 我们决不辜负我们的父母对我们的期望。 His friends failed him when he most needed them. 当他最需要朋友的时候，他们却令他失望。 衰退；衰弱 The wind failed and the sea returned to calmness. "风停了,海面上恢复了一片寂静。" （事业）倒闭，破产 fail vt. 失败, (考试)不及格 缺少 使失望; 对(某人)辜负 疏忽, 未履行 When I wanted his help he failed me. 当我需要他帮助时, 他却使我失望。 The teacher failed me in mathematics. 老师给我数学不及格。 Words failed me at the last minute. 到最后我说不出话来了。 fail vi. 失败, 不及格; (判断)错误, 不中目标 [与不定式连用]不能, 不(做), 忘记; 疏忽 不足, 缺乏(in); (作物)歉收 (健康、体力、视力等)衰退; 减弱 停止作用; 故障; 停(水), 断(电) 破产、倒闭 绝, 全无 He failed to come. 他未能来。 He fails in courage. 他不够勇敢。 He never fails to write to his mother every week. 他从来没有忘记每周给母亲写信。 His health is failing rapidly. 他的健康迅速衰退 。 The patient's heart failed. 病人的心脏停止了跳动。 fail n. 失误, 迟误 考试落第者 I'll pay you tomorrow without fail. 我明天付款给你, 决不迟误。