新概念英语53课问题Yesterday,the firemen examined the ground.和Yesterday,the firemen have examined the ground.有什么区别?They were also quite sure that a cigarette end did not start the fire.和They were also quite sure that a cigarette

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新概念英语53课问题Yesterday,the firemen examined the ground.和Yesterday,the firemen have examined the ground.有什么区别?They were also quite sure that a cigarette end did not start the fire.和They were also quite sure that a cigarette
新概念英语53课问题
Yesterday,the firemen examined the ground.和Yesterday,the firemen have examined the ground.有什么区别?
They were also quite sure that a cigarette end did not start the fire.和
They were also quite sure that a cigarette end were not start the fire.
有啥区别?

新概念英语53课问题Yesterday,the firemen examined the ground.和Yesterday,the firemen have examined the ground.有什么区别?They were also quite sure that a cigarette end did not start the fire.和They were also quite sure that a cigarette
(请教有关学习方面的怎么不去精锐一对一那边呢)