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It is said that the new teacher was once a policeman.Yes.He_____a policeman for 6 yearsbefore,he_____a PE teacher two years ago.A.had been;became B.hasbeen;became C.has been;becomes D.was;had become选项和理由顺便告诉我过去完成时和现 关于数学的真理性,只能通过实践来检验吗?在公理基础上经过严格的逻辑演绎推理,得出的结论,也必须经过实践检验才能确认其真理性吗? What I would suggest is to start work at once.这句是什么从句,to start不定式怎么看出是做表语? 西游记第27回的概括及读后感!急!最好概括字数不超过350字,高于300字谢谢! 抢分啊不作答快 数学 价钱的 送分平面面积 1.00米剩余1.00米的 等于95元 已知而 0.61米剩余1.20 米 等于多少元? 西游记总结性读后感 核舟记 提到的佛印和鲁直,是苏东坡的什么人 人类历史上具有永恒价值的书是哪些 It is all ill bird that fouls own nest who和that怎么运用 The stadium is for the Olympic Games,It is like a bird＇s nest. When I said students are lazy ,I ______to youa:do not referb:was not referring c:did not refer d:has not referred it seems that he is ill与it seems that he were ill 的区别? 《核舟记》中突出苏东坡形象特征的句子是 这个暑假是多少天,2009年6月26日星期五到2009年9月1日星期二 《核舟记》中表明苏轼泛舟游赤壁的时间的句子 《核舟记》中说明苏轼主人地位的语句是什么 初二数学题 要过程且明白 为什么核舟记从苏东坡介绍起为什么苏东坡、黄庭坚、佛印要从苏东坡介绍起呢? 数学的几道小题1、1X｛-5｝ X是乘以2、1+｛-5｝3、-1X｛-5｝4、-1+｛-5｝5、1÷｛-5｝6、1-｛-5｝7、-1÷｛-5｝8、-1-｛-5｝ our school ________(have) a sport meeting yesterday 用动词的适当形式填空. 1、能被2145整除且恰好有2145个约数的数有几个?2、10个盒子共装有1000个弹子,问怎样装法装法能使顾客在购买1至1000之间的任何数目的弹子时,不用打开盒子,便可拿到所购数目的弹子?不用每道 Our family-----lunch at noon yesterday.(have)A have B was having C is having Dwere having 计算题.1.√5*(√9/20)2.(√12*√6)/√83.√5-√1/54.(√2-3)^2(√2+3)^2 I have bread yesterday.在这句话中have的意思是什么?I had bread yesterday.在这句话中had的意思是什么？ 几道数学小题 能做几道做几道一:甲多开支100元,三年后负债600元．求每人每年收入多少?二:一个人以3千米/小时的速度上坡,以6千米/小时的速度下坡,行程12千米共用了3小时20分钟,试求上坡与 几道小题,帮帮数学在35米的游泳池里,甲和乙分别用每秒2米和每秒1.5米的速度,同时从起点出发,经多少秒后,甲游到端点反游时与乙相遇? I want buy a big house ______ interesting garden. 下划线处填 Has an 还是 With an Nest to the hotel is a small house with an interesting garden帮帮忙分一下句子成分,急用 求数列an=1/（n+1) 的极限（详解） 急!数学小题!已知f(x)=根号3*sin2x-2sin^2x.若x属于[-π/6,π/3],求f(x)的值域 --I hurt my leg when I was playing football yesterday afternoon.A.I'm sorry to hear that.B.Why weren't you careful?C.Oh,really?D.Are you Ok now?