等差数列前n项和奇偶

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whose father is a doctor?翻译 He has a friend whose father is a docto He has a friend是定语么 如果是,那whose怎么没有省略? During ( )century ,the world population has already reached 6billion.a,twenty b.the twentieth c.twentieth d,the twenty 沙发的英文怎么写? -Thanks for your help,but can you do me one more favor ,please?-_D_ ,sir.What's it then?C.That's all right D.At your service为啥不选C 句型转换 they are pleying football now.(用often代替now) They are watchingthe football match 用often 改写句子 带有定语从句的复合句中who和whom有什么区别?说详细点,最好有例子 英文名中带win的发音和这三个字母的英文名w,i,n 三个字母最好连在一起 而且要发Win 这个音Winifred Winni 这2个免了 it isn't a fine day ,isn't?这个句子哪里错,改过来 美发音结尾的英文名 有没有末尾以发音fei结尾的英文名啊 (女孩名) 《光辉的旗帜》--读后感(演讲稿)读后感《光辉的旗帜》-- 求一篇(光辉的旗帜)的演讲稿.或者是读后感,收获. 奥巴马芝加哥演讲里的1分19秒if there 怎么念成A 责呢?if there is anyone out there. My watch does not work.Could you mend it?Sorry,but the worker in the shop may be( )A.careful B.kind C.hard--working D,helpful,求详解 Would you please___the watch for me A repairing B to repairC repairD repaired I'm sorry this watch can't_____(mend) ( )Can l —— you some questions A.asks B.asking C.ask D.tell The ( ) should be taken good care of .They are too young.A.one-year-old B.one-year-old child谢谢 Linda, make sure the tables____ before the guests arriveA.be set B.set C.are set D.are setting选什么,为什么呢?谢谢!15 [D91] Linda,make sure the tables____ before the guests arrive .A.be set B.set C.are set D.are setting翻译并分析 15.Linda make sure the table________ before the guests arrive A. be set B. set C. are s这是2010年全国卷,答案选c.我的问题是table是不是应该加s?难道印错了! 求解Linda,make sure the tables are set before the guests arrive.不明白make不应该用单三吗 语法填空:Linda make sure the tables_____(set) before the guests arrive.句子中为什么填are set,不可以填set(非谓语)?为什么make sure+从句不可用非谓语,而make sure of+sth才可用非谓语 Can you help me?-------Thanks a lot 这个句子有问题明明是让别人帮你为什么别人还要说thanks a lot. I am sorry for< >yesterday.A.wake you up B.wake up you C.waking up you D.waking you upwakeyo.keepr Sorry,I need some time to wake up.Can you try again in a few minutes? I\'m sorry,last night wake you up for sleeping!什么意思 阿拉丁神灯问问题为什么老是出现Sorry,I need some time to wake up.Can you try ag original design什么意思是一件裤子上的,什么意思? Original Graphic Design