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            • 1． ________ according to the directions，the machine can be running smoothly．（　　）
              A．When operate
              B．When operated
              C．When to operate
              D．When to be operated
              难度：中等
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            • 2． The research is so designed that once ______ nothing can be done to change it．（　　）
              A．begins
              B．having begun
              C．beginning
              D．begun
              难度：中等
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            • 3． All of these letters and telegrams，almost without exception，urge that the cause we have been fighting for_______．（　　）
              A．be carried on
              B．being carried on
              C．carrying on
              D．to carry on
              难度：中等
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            • 4． Mother reminds，“______rain，take an umbrella．”as spring approaches．（　　）
              A．Shall it
              B．It shall
              C．Should it
              D．It should
              难度：中等
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            • 5． — The drunk driver wishes he _____ so many injuries in the accident.
              — But he _____.
              [     ]

              A. hadn't caused; had 　
              B. didn't cause; did
              C. hadn't caused; did 　
              D. hasn't caused; has
              难度：中等
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            • 6． In my opinion, hard work is as important as, ______ an efficient way in study.
              [     ]

              A. if not as important than
              B. if more important than
              C. if not more important than
              D. if as important as
              难度：中等
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            • 7．

               Though _______ money, his parents managed to send him to university．

              A．lack of        lacking of       C．lacking                    D．lacked in

               

              难度：难
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            • 8．

               In summer, food will go bad if       in room temperature.

                  A．leaving          B．left             C．being left           D．having left

               

              难度：中等
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            • 9．

               ---What do you think of Jack?

              ---He is not a bad boy. ______, he’s a pretty good one.

              A. If ever               B. If busy          C. If anything      D. If possible

               

              难度：中等
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            • 10．

               While building a bridge over the Changjiang River，          ．

              A．a big rock was discovered in the water

              B．there was a big rock discovered

              C．a big rock discovered in the water

              D．the workers discovered a big rock in the water

               

              难度：中等
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