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            • 1． The silence of the library ______only by the sound of pages being turned over．（　　）
              A．had been broken
              B．breaks
              C．broke
              D．was broken
              难度：中等
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            • 2．
              They were ahead during the first half of the match, but they _____ in the last five minutes.

              A. were beating
              B. beat
              C. were beaten
              D. had been beaten
              难度：中等
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            • 3．
              Welcome to the Science Museum, everyone! This stone axe _____ in South Africa and experts can't be exactly sure about its use.

              A. had been found
              B. was found
              C. has been found
              D. would be found
              难度：中等
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            • 4．
              People begin to know that most environmental problems exist because necessary measures for preventing them _____ taken in the past.

              A. are not
              B. were not
              C. hadn't been
              D. wouldn't be
              难度：较易
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            • 5．
              After the argument, he spoke with the department manager and the problem _____. 

              A. solving
              B. had been solved
              C. was solved
              D. solved
              难度：较易
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            • 6．
              — I don't think we have met before. 
              — Yes, once at a party, but we ______.

              A. didn't introduce
              B. weren't introduced
              C. haven't introduced
              D. weren't introducing
              难度：中等
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            • 7．
              The song reminded me of those days when I ____ care of by my grandparents in my home village.

              A. was taken
              B. took
              C. had been taken
              D. had taken
              难度：中等
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            • 8．
              Recently two pieces of wrapping paper dating from about 700 years ago ____ the earliest paper advertisements,much older than similar ads in the West.

              A. have considered
              B. considered
              C. were considered
              D. have been considering
              难度：中等
              解析 收藏 试题篮
            • 9．
              ― The fishermen should have been warned of bad weather.
              ― _____, but they didn't listen to it.

              A. So were they
              B. So should they
              C. Yes, they were
              D. Yes, they should.
              难度：中等
              解析 收藏 试题篮
            • 10．
              The computer looks old, but it ______ just half a year ago.

              A. has been bought
              B. will be bought
              C. is bought
              D. was bought
              难度：中等
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