Ten years ago, I had worked as a night guard in a factory. On a rainy night, all

Ten years ago, I had worked as a night guard in afactory. On a rainy night, all the lights of factory went out all of a sudden.I rushed out and could see nothing. Lucky for me, the warning system wasdirectly connected with the police station. Three or four minutes late, fourpolice car arrived at the front gate. They searched for the factory carefully,tried to find something unusual. In the end, I am told that the rain hadbrought about   the short circuit, that caused the accident.

试题答案

【答案】

 去掉had

 of后加the

 and改为but

 Lucky→Luckily

 late→later

 car改为cars

 去掉for

 tried→trying

 am→was

 that→which

【解析】

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