从下文（主句）叫警察来看,此事还在进行中
所以用 see sth happening 好些.
还有,如果用happened 不能看成是过去分词,因为happen不及物,而如果看成是过去式,时态又不对
请及时采纳,不懂继续问( 天天在线 ）
when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?
when he saw it happening,he called the police.这里的为什么用happening?而不用happened呢?
英语人气：689 ℃时间：2020-03-26 21:15:28
优质解答
我来回答
类似推荐
- he called the police when he saw the accident,_____his mobile phone A by B use C.with D.using
- I happened ____ the street when I heard my name called.
- We don't know when the accident________.A.has happened B.happened C.happening D.to happen
- When he saw the damage_____to his car ,he was so angry that he called the police
- I have no idea what _____when I was asleep.A is happening B did happen C happened D was happened