导数求极值步骤

关于since的选择题39.–How long has this bookshop been in business?-- _______ 1994.A.After B.In C.From D.SinceC为什么不行哦from也有从什么时候起的吧 关于since It's almost three years____I last saw her.A.since B.when C.that D.after答案是选A,但不是说since 只能用于完成时的吗?此题做何解释呢? Why is a river very rich? Alice is brave同义句（英语） 快乐寒假五年级上册 Our English teacher is Alice brown.(改为同义句) 2009年五年级上册快乐寒假 Our English teacher is Alice Brown.(改为同义句） Alice Brown ____ ____ English. 根据所给的单词及标点提示连词成句 you,Mrs,Wu's,daughter,are,__________? has one it eye only怎样连词成句 翻译以下到中文 Why is a river rich? Because it has two banks Why is a river rich?Because_A:it always had two banks B:it had a lot of waterC:it had fish in it D:it is far from us 初二英语（用“since”和“for”填空）1.Jim has been sleeping _____ nine o'clock.2.Lucy has been running _____ half an hour.3.Sarah has been talking on the phone ______ five minutes.4.Louis has been studying Chinese ______ he was six year 初二英语用for或since填空.1.My family has owned a ship _____ 1920.2.My family has owned a ship _____ many years.3.I have had a cold _____ last Monday.4.I have had a cold _____ 5 days ago.6.I have had a cold _____ 5 days. 有没有【爱德华的奇妙之旅】的全部阅读~来自星星的你里面的那本书我真的非常想看 children can have lots of nice food ,they always e() themselves very much,根据首字母填空. 太好了,翻译成英语 比较since和for 你给我提了这么多的建议真是太好了是中文翻译成英文 懂英文的进来一下Warring!Miss Character MAP Position 可以确定以上语句都正确.没有错字 the children said __they__ themselves very much a.if.enjoy b.that.enjoyed c.why.enjoy d.where.enjoy 懂英文的进来一下,Everyday I miss my dear.She is my favourite.I wish she can hear the sound of my heart. sb.went to Tokyo for a holiday,who could not return home because he didn't have enough money.对不 用for或since填空1.Jill has been in Ireland_______ Monday.2.Jill has been in Ireland_______ three days.3.My aunt has lived in Australia_______ 15 days.4.Margaret in her office.She has been there ______ 7 o'clock.5.India has been an indendent count 用since和for填空i’ve been here------two years i’ve been here------ yesterday i’ve been here-------i was a child i’ve been here-------two years agohe’s been in class --------4 o’clockhe’s been in class --------an hour agohe’s been 用since 和for 填空请用since和for填空.并说明理由,万分感激!I haven't seen you__your wedding.I've been __over an hour.I've had this much fun__I was kid. 用since或for填空.1、Mike has been sstudying english_he was six years old.2、i have been watching you_tow minters.3、i have been parcticing the piano_10:30. ____,he often helps me with my studyA however he is busy D no matter how busy he is 麻烦问下 however不能放句首吗如果可以的话,no matter how busy he is要倒装吗 I want study english with foreign friend . I'm in shijiazhuang 求一篇英语作文. a letter of inquiry假如你是王琳,准备假期出去游玩.请给旅行社写一封信.咨询景点特色,住宿条件.交通方式 收费标准等、 有关a letter of congratulations的英语作文 英语写作（Letter of Apology)请根据下面所给的题目和情景,用英语写出一篇不少于80词的短文.某天下午,由于你说了一些无礼的话,惹怒了你的同学/同事,事后你有所悔悟.请你给他/她写封信,表示