左极限不等于右极限

The boy ______(run) to the door and opened it. 89.when I was about to go out,the door opened----------89.when I was about to go out,the door opened----------A.of itself B.by itself C.oneselfD.for itself has been doing have been done区别 have been doing sth had 加过去分词 have has 加过去分词 分别是什么时态?求什么区别?最好有例句、、 i has been doing 还是i have been doing 用(turn left)(turn right)(go straight)(north)(west)(east)(south)分别造一个句 这段话里的radio是什么意思如题 以上value值的含义? 谁的谢谢 米快 如何在选择 时必须输入 意见反馈:(选择不满意须填写填写意见反馈,以便我们及时将你的意见回馈给相应领导处理,以提高我们的服务质量,感谢你的配合)(为了让你可以清楚地描述情 At that time she was the first woman ever____a lecture in publicA to give B.to have given为什么不用to have given?不是强调give在be the first woman之前吗?两个动作又不是很紧凑的. seven(序数词) 紧急紧急she had a great time ___in park?she had a great time ___in park?a .play b.plays c.played d.playing选哪个?为什么不选其他三项呢? Ten woman fells that she should let her son ___ his own decision this time.A.makes B.make C.to make D.makeingA.makes B.make C.to make D.makeing have 通常在什么时态用?是过去分词吗? have/has been+过去分词是什么时态? i wouldn't have been +过去分词是什么时态?例句 i wouldn't have been scared anyways John began to study english last sunday.A.his brother did so B.so did his brotherC.so his brother did D.his brother so did我认为选B.答案选D.为什么谢谢! this is our classroom This classroom is----------we us our ours This is（）【we】classroom. （）【our】like it.用括号内所给单词的适当形式填空. This is not ____(we) classroom.____(our) is in Building A This is not ____(we) classroom.____(our) is in Building somebody put the card face down.could you please turn it ()?A over B up C off D on说明原因 根据上下文将文章补充完整 This is our classroom. This is M_________Zhang. She is our English teacherThis is our classroom. This is M_________Zhang. She is our English teacher.She is beautiful.There are many desks and chairs in our classroo turn down turn up 还有些什么有关turn的短语吗? ( ) 27.bus ride B.ride a bike C.take a bus D.go by air哪个不是一类的为什么 英语：他7岁就开始学习英语 Seven years old he began to study english一个句子能出现两个动词?（began to 开始,study学习）?为什么两个动词能连用...我基础差 have/has+been to是什么时态 我想问一下完成时态中 has been ,have heen 和had been 能举例吗, had been 和 has/have been的区别是什么? 有一首英文歌,歌词貌似是everything you turn me down down ,turn me down down 是一首很high的歌曲,求求歌曲名字 一首女生唱的英文歌曲 歌词第一句是 you turn me upside down 中间就近乎与说唱 知道的说下歌名谢谢不是这几首