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            • 1． We________for 3 years with no result，so we have decided to give it up．（　　）
              A．have been researching
              B．researched
              C．research
              D．had researched
              难度：难
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            • 2． ---Jenny is becoming slimmer and slimmer．
               I tis said that she hired a fitness instructor last year and _____ since．（　　）
              A．is working out
              B．worked out
              C．has been working out
              D．had worked out
              难度：难
              解析 收藏 试题篮
            • 3． -So much remains to be done!
              -Well，it"s not surprising． So many people      all the time recently．（　　）
              A．come
              B．have come
              C．have been coming
              D．came
              难度：难
              解析 收藏 试题篮
            • 4． You _______ my peace of mind since divorce．（　　）
              A．have been violating
              B．were violating
              C．had violated
              D．has been violated
              难度：难
              解析 收藏 试题篮
            • 5． Investigators are working on the assumption that the cell_________ a far bigger attack, involving Paris-style shootings as well as suicide bombings.

               

              A．has been planning
              B．had been planning       

               

              C．is planning
              D．has planned
              难度：难
              解析 收藏 试题篮
            • 6． Over the years，while focusing on its own development，China _____ aid to the best of its ability to other developing countries with various difficulties．（　　）
              A．provides
              B．is providing
              C．has been providing
              D．will provide
              难度：难
              解析 收藏 试题篮
            • 7． The 5-year-old boy has been ______ for half a year and his parents ______ him very much, feeling very sad.

                

              A．missed ; miss
              B．missing ; miss   

              C．missed ; missing
              D．missing ; missed

              难度：难
              解析 收藏 试题篮
            • 8．

              Please stop to have a break. You _________ he washing machine the whole morning.

              A．have repaired
              B．were repairing
              C．have been repaired
              D．have been repairing
              难度：难
              解析 收藏 试题篮
            • 9． — I wonder if you could go to the movie with me, Jennifer.

                 — Sorry, Johnson. I ________ a composition all day and haven’t finished it.

                

              A．have been writing
              B．was writing
              C．have written
              D．write
              难度：难
              解析 收藏 试题篮
            • 10．
              Over the years，while focusing on its own development，China _____ aid to the best of its ability to other developing countries with various difficulties．（　　）
              A．provides
              B．is providing
              C．has been providing
              D．will provide
              难度：难
              解析 收藏 试题篮
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