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B: If是否,可以引導條件狀語從句; C: Though雖然; D: While當……時,然而。Whethert seen each other ___________ she went to the USA 10 years ago. A.除非保護水資源,否則我們沒有水喝,所以用unless,故選D。 【點評】考查連詞辨析,根據(jù)上下文的聯(lián)系確定所使用的連詞。B.——沒關系。25.—I39。UnlessC.舉起手的條件是知道答案,所以用if,如果,故選B。20._______________ you know the answer, please _______________ your hand quickly. A.until只完成了一半。C. has18.—When will the railway that connects the two cities open? —When。 根據(jù)語境可知,此處表選擇,用or。 that【答案】 A 【解析】【分析】句意: 長城是如此著名,以至于每年都有許多世界各地的游客來參觀它。 lots of visitors all over the world e to visit it every year. A.C.14.___________ you know the answer, please ___________ your hand. A.if【答案】 A 【解析】【分析】句意:這部電影似乎很有趣,我們都想看。C.A. 盡管;B. 因為;C. 如果,根據(jù)兩句的關系可知是讓步狀語從句,although:盡管,故選A。because11.A recent survey shows that 44 percent of Americans want to use selfdriving cars, _________ 34 percent believe that they will make the roads mote dangerous. A.although注意定語從句的關系詞的使用。C.t like stories _____have sad endings. A.s father was cleaning the car _______________ his mother was doing housework. A.B.because【答案】 B 4.You will find it useful to learn to study by yourself _____ you go to college. A.C. that【答案】 A 【解析】【分析】句意: 當這個小男孩知道期末考試的結果時,他激動得說不出話來。 as that toA太而……不能,不引導從句,B如此……以至于,修飾形容詞,引導結果狀語從句,C和……一樣,不引導從句,D如此……以至于,修飾名詞,引導結果狀語從句,excited是形容詞,此處是結果狀語從句 , 故選A。D.B.andwhileD.C.oralthoughD.thatwhere10.Your dream will e true ______________ you put your heart and soul