11.(2009重慶)Peter was so excited __________ he received an invitation from his friend to visit Chongqing.
A. where B. that C. why D. when
答案：D
解析：句意“當(dāng)Peter的朋友邀請(qǐng)他來重慶時(shí)，他非常興奮”，此題考查狀語從句，只有when引導(dǎo)的時(shí)間狀語從句符合題意。

12.(2009福建)She had just finished her homework __________ her mother asked her to practice playing the piano yesterday.
A. when B. while C. after D. since
答案：A
解析：句意“昨天她剛做完作業(yè)，她媽媽就讓她練習(xí)彈鋼琴”，when在本句中作并列連詞，意為：and at that time。while作并列連詞，表示“對(duì)比轉(zhuǎn)折”；after為從屬連詞或介詞，意為“在……之后”；since表示“自從……時(shí)候，既然……”.

13.(2009浙江)The medicine works more effectively __________ you drink some hot water after taking it.
A. as B. until C. although D. if
答案：D
解析：句意“這種藥如果你用熱水送服，就更加有效”，if引導(dǎo)條件狀語從句。

14.(2009湖南) __________ the police thought he was the most likely one, since they had no exact proof about it, they could not arrest him.
A. Although B. As long as C. If only D. As soon as
答案：A
解析：句意“雖然警察認(rèn)為他最有可能是罪犯，但沒有確鑿的證據(jù)，他們不能逮捕他”，句子前后的邏輯關(guān)系為轉(zhuǎn)折關(guān)系。

15.(2009江西)According to statistics, a man is more than twice as likely to die of skin cancer __________ a woman.
A. than B. such C. so D. as
答案：D
解析：句意“據(jù)統(tǒng)計(jì)，男性死于皮膚癌的幾率是女性的兩倍多”，本題考查倍數(shù)的表示法，核心結(jié)構(gòu)為：It times as likely to die of cancer as …，只不過…times衍生成了more than twice兩倍多，在此more than修飾twice。

16.(2009江西)Some of you may have finished unit one. __________, you can go on to Unit two.
A. If you may B. If you do C. If not D. If so
答案：D
解析：句意“你們中的一些人可能已經(jīng)完成了第一單元，如果這樣的話，你們可以繼續(xù)進(jìn)行第二單元”，本題考查so和not的用法。

17.(2009江蘇) __________ unemployment and crime are high, it can be assumed that the latter is due to the former.
A. Before B. Where C. Unless D. Until
答案：B
解析：句意“在失業(yè)率和犯罪率高的地方，可以想象的到，后者是由前者引起的”。

18.(2009安徽) — I wonder how much you charge for your services.
— The first two are free __________ the third costs ＄30.
A. while B. until C. when D. before
答案：A
解析：句意“我想知道你要收多少服務(wù)費(fèi)”“前兩次是免費(fèi)的，第三次的費(fèi)用是30美元”，while而，但是；until直到；when這時(shí)候；before之前，才。

19.(2009山東)The little girl who got lost decided to remain __________ she was and wait for her mother.
A. where B. what C. how D. who
答案：A
解析：句意“那個(gè)迷路的小女孩決定待在原地等她的母親”，where引導(dǎo)地點(diǎn)狀語從句。

20.(2009遼寧)It just isn’t fair __________ I was working as a waiter last month, my friends were lying on the breach.
A. whenever B. though C. for D. while
答案：D
解析：句意“上個(gè)月我在做服務(wù)員時(shí)，我的朋友們卻躺在海灘上，這不公平”，while引導(dǎo)時(shí)間狀語從句，從句常用進(jìn)行時(shí)態(tài)。Whenever無論何時(shí)，每次，引導(dǎo)讓步狀語從句或名詞性從句；though盡管，雖然，引導(dǎo)讓步狀語從句；for因?yàn)?，引?dǎo)原因狀語從句，三項(xiàng)均不符合句意。

?