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        1. The city park will be cleaner ___________ people stop dropping litter here and there.
          A.whileB.ifC.unlessD.before
          B

          試題分析:while然而,當……時;if是否,如果;unless除非;before 在……之前。句意:如果人們停止到處扔垃圾,這個城市公園將會變得更加清潔。結(jié)合語境可知選B。
          點評:連詞在句子中主要起聯(lián)系上下文的作用,他們之間的區(qū)別就是表示邏輯關(guān)系的不同,所以在解題時先要理解上下文含義,然后根據(jù)上下文邏輯關(guān)系選擇合適的連詞。連詞的用法都比較多,語義之間還有交叉,熟記其基本應(yīng)用規(guī)則,了解其區(qū)別,注意固定搭配對象,是做好此類題型的關(guān)鍵。
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