新概念英语53课问题Yesterday,thefiremenexaminedtheground.和Yesterday,thefiremenhaveexaminedtheground.有什么区别?Theywerealsoquitesurethatacigaretteenddidnotstartthefire.和Theywerealsoquitesurethatacigarette

问题：新概念英语53课问题Yesterday,thefiremenexaminedtheground.和Yesterday,thefiremenhaveexaminedtheground.有什么区别?Theywerealsoquitesurethatacigaretteenddidnotstartthefire.和Theywerealsoquitesurethatacigarette

答案：↓↓↓

陈光星的回答：

网友采纳　　(请教有关学习方面的怎么不去精锐一对一那边呢)