He happened to be there when the accident happened.
事故发生时，他正好在那里。
It was noon when the accident happened.
事故发生时已是正午。
No one knows when the accident happened.
谁也不知道事故是何时发生的。
He was on the scene when the accident happened.
意外发生的时候他就在现场。
What were you doing when the accident happened?
当事故发生的时候，你在做什么呢?。
I was not on the spot when the accident happened.
老实说，事故发生时我不在现场。
He was driving a hire car when the accident happened.
当事故发生时他正驾驶一辆租来的汽车。
We were talking to Frank, when the accident happened.
事故发生时我们在与弗兰克谈话。
When the accident happened, the usual crowd gathered.
事故发生时，照例有许多人围观。
Someone was howling in pain when the accident happened.
事故发生的时候有个人痛得嚎啕大哭。
Ten miners were buried alive when the accident happened.
当事故发生时，十名矿工被活活埋在里面。
It happened that he was there when the accident happened.
事故发生时，他正好在那。
Who was the driver of the car when the accident happened?
车祸发生的时候是谁在开车？
A crowd was waiting for the bus when the accident happened.
事故发生时，有一群人在等候公共汽车。
The engineer hurried to find out when the accident happened.
工程师赶忙去事故找什么时间发生的。
When the accident happened quite a crowd quickly gathered round.
事故发生后，很快就在周围聚拢了相当多的人。
The lawyer :"How far away were you when the accident happened?""
律师说：“当车祸发生的时候，你在多远的地方？”
When the accident happened, quite a crowd quickly gathered round.
事故发生后，很快就在周围聚集了很多人。
When the accident happened, a lot of people quickly gathered round.
事故发生后，很快周围聚集了很多人。
They were only 100 metres off the summit when the accident happened.
事故发生时他们离峰顶只有100米远。
When the accident happened, John was riding his bicycle along the street.
当车祸发生的时候，John正沿著街道骑著他的脚踏车。
There were two witnesses who happened to be standing by when the accident happened.
事故发生的时候恰好有两名目击者在场。
When the accident happened, Mrs Jones were waiting for the bus at the bus station.
当事故发生时，琼斯太太正在汽车站等车。
The witness: "Because when the accident happened I took out a tape and measured it."
目击证人说：“因为当车祸发生的时候，就拿出了卷尽测量过宦。”
The group was thought to be on its way back from a hunting trip when the accident happened.
死者被认为是在打猎回来的途中，意外发生了。
The Libyan plane was flying from the South African city of Johannesburg to Tripoli when the accident happened.
据悉，这架飞机是由南非约翰内斯堡飞抵的黎波里机场的。
When the accident happened Sam was taking a shower Nick was watching TV. Then they helped the injured people together. .
当事故发生时，山姆正在洗澡，尼克正在看电视，然后他们一起去帮助伤者。
Fortunately when the accident happened there was a doctor who kept his wits about him and was able to help those who had been injured.
幸运的是，事故发生时有一个头脑冷静的医生在场，能够帮助救护受伤者。
Fortunately when the accident happened there was a doctor who kept his wits about him and was able to help those who had been injured.
幸运的是，事故发生时有一个头脑冷静的医生在场，能够帮助救护受伤者。
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