1、Unit 23Period Three.单句改错1Only when he 50 years old did he begin to learn French._2Little she know Tom was badly ill._3Turn to the right and there you be._4And all around the fox in a circle was dogs._5I dare climb this tall tree, but do you?_6Not once he keep his promise._【答案】1.在he后加was2.在she前加did3b
2、e改为are4.was改为were5do改为dare6.在he前加did.单项选择1At the meeting place of the Yangtze River and the Jialing River _， one of the ten largest cities in China.Alies ChongqingBChongqing liesCdoes lie ChongqingDdoes Chongqing lie2John opened the door. There _ he had never seen before.Aa girl did standBa girl sto
3、odCdid a girl standDstood a girl3Not until he left his home_to know how important the family was for him.Adid he beginBhad he begunChe beganDhe had begun4We laugh at jokes，but seldom_how they work.Awe thinkBthink weCwe do thinkDdo we think5Had I known about this computer program，a huge amount of tim
4、e and energy_.Awould have been savedBhad been savedCwill be savedDwas saved6Unsatisfied _ with the payment, he took the job just to get some work experience.Athough was heBthough he wasChe was thoughDwas he though7So sudden_that the enemy had no time to escape.Adid the attackBthe attack didCwas the
5、attackDthe attack was8It was_he came back from Africa that year_he met the girl he would like to marry.Awhen；thenBnot；untilCnot until；thatDonly；when9Little_about her own safety，though she was in great danger herself.Adid Rose careBRose did careCRose does careDdoes Rose care10Hearing the dog barking
6、fiercely，away_.Afleeing the thiefBwas fleeing the thiefCthe thief was fleeingDfled the thief11Try _ she might，Sue couldnt get the door open.AifBwhen CsinceDas12Only when he reached the teahouse _ it was the same place hed been in last year.Ahe realizedBhe did realizeCrealized heDdid he realize13Only
7、 after they had discussed the matter for several hours _ a decision.Athey reachedBdid they reachCthey reachDdo they reach14For a moment nothing happened.Then _ all shouting together.Avoices had comeBcame voicesCvoices would comeDdid voices come15When can I use your computer?Never！_ should you touch
8、it!AAt no timeBIn no timeCAt any timeDAt one time【答案及解析】1A表示方位的地点状语提前的，句子完全倒装，所以选A项。2D句意：约翰打开门，那里站着一个他从来没有见过的姑娘。there位于句首用完全倒装。3A句意：直到离开家，他才开始知道家对他来说是多么重要。not until位于句首，主句要部分倒装，排除C，D两项。句子时态为一般过去时，所以选A项。4D句意：我们因为笑话而笑，但很少去想笑话使人发笑的原因。seldom是否定意义的副词，位于句首，主句要部分倒装。5A句意：如果我了解这种电脑程序的话，就可以节约大量的时间和精力。考查if引导的虚
9、拟条件句。前半句“Had I known about this computer program”，是部分倒装结构，if省略并提前had，可知是对过去虚拟，主句应用would have done结构，根据句意又可判断用被动语态，故选A。6B句意：尽管对工资不满意，但为了获得工作经验，他接受了这份工作。本题考查though引导状语从句可用倒装形式的用法，从句中的表语、状语或动词原形置于句首，但主谓顺序不变。本句可写为：Though he was unsatisfied with the payment。7C句意：这次袭击非常突然以至于敌人没有时间逃跑。soadj.放于句首，主句用部分倒装。sud
10、den为形容词，故用系动词was。正常语序为：The attack was so sudden that the enemy had no time to escape.8C句意：直到那年从非洲回来，他才遇见想娶的女孩。考查not until的强调句式，即：It is/wasnot until(状语)that其他部分。9A句意：虽然自己身处危险中，但罗丝丝毫不介意个人的安危。副词little是否定意义的词，位于句首，主句要部分倒装。结合时态要用助动词did。10D句意：听到狗的狂叫声，小偷就逃掉了。本题考查完全倒装句。后半句正常语序是：the thief fled away。完全倒装句的结构一
11、般是：状语(副词，介词短语等)谓语动词主语(名词)。11Das引导让步状语从句，意为“尽管，虽然”，要求从句使用部分倒装，即从句中表语，状语或动词原形置于as前。12Donly修饰状语置于句首时，句子(主句)需部分倒装，故选D。13Bonly修饰状语(从句)置于句首时，后面的句子要部分倒装；再根据题干中的过去完成时可知设空处应该用过去时，故选B。14B句意：一时间，什么都没发生。之后大家一起欢呼起来。副词then，away，out等置于句首，且主语是名词时，主谓要完全倒装。15Aat no time“任何时候都不”，位于句首时，该句用部分倒装语序。in no time“立刻”，不具有否定意义。故选A。