英语问题

Question

he was often seen ------- his office late at night, but he was last seen ------ there at 5pm yesterday（leave）

Answer 1

He was often seen _to leave_ his office late at night, but he was last seen _leaving_ there at 5 pm yesterday（leave）
译：经常有人看见创深夜离开办公室。可昨天晚上五钟时有人看见他正要离开那儿。
析：see sb. do sth. 是“看见某人做了某事”（全过程），注意其被动语态是：sb. be seen to leave, 有to不定式作主补。
see sb. doing sth. 是“看见某人在做某事”
评：前一句应改为一般现在时态He is often seen ...

Answer 2

he was often seen ---leaving---- his office late at night, but he was last seen ---leave--- there at 5pm yesterday（leave）
解析：
see sb. do sth表示看到某人做某事，全过程都看到了
see sb.doing sth表示看到某人正在做某事，并非看到全过程。

Answer 3

第一空：see sb do，看见某人做某事，全过程都看到了，故为leave
第二空：see sb doing，看见某人正在做某事，并非看到全过程，故为leaving

Answer 4

一个空表一贯动作用一般时态即leave，第二个是过去某一次用过去式left~~~希望能帮到你~~

Answer 5

leaves,left

Answer 6

he was often seen ------- his office late at night, but he was last seen ------ there at 5pm yesterday（leave）