Did you see the traffic accident yesterday?Yes ,I saw it when I past the school gate.A.happen;walkB.happen;was walkingC.happened;walking D.happening;have walked为什么不选D see sb doing sth

来源：学生作业帮助网编辑：作业帮时间：2024/05/04 18:34:16

Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.A.happen;walkB.happen;was walkingC.happened;walking D.happening;have walked为什么不选D see sb doing sth
Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.
A.happen;walk
B.happen;was walking
C.happened;walking
D.happening;have walked
为什么不选D see sb doing sth

Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.A.happen;walkB.happen;was walkingC.happened;walking D.happening;have walked为什么不选D see sb doing sth
应该选 B
你看见昨天的交通事故了吗?
是的,当我正经过校门口的时候看见了事故的发生.
如果选 D ,第一个空用 happening 可以
但是第二个空用现在完成时与时间状语 yesterday 不相符.

doing是指看见一个瞬间不是指整个过程完整的事件如accident 就不能用。（在作任务呢望采纳感激不尽！）

see sb doing sth,表示看到某人正在干某事

B.happen;was walkingsee sb doing sth，强调动作的持续性。所以不能用

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