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            • 1． The professor was delighted to find that two thirds of the project     by the students independently．（finish）
              教授高兴地发现学生们已独立完成了该项目三分之二的工作．
              难度：中等
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            • 2． The retired teacher is said to have returned from the USA，where he ______ by some of his old students．（　　）
              A．would be visited
              B．visited
              C．had been visited
              D．have been visited
              难度：中等
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            • 3． When the fisherman turned around，he found a fish ______．（　　）
              A．had hooked
              B．was hooking
              C．had been hooked
              D．was hooked
              难度：中等
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            • 4．
              The police found that the house _____ and a lot of things _____.

              A. has been broken into, has been stolen
              B. had broken in, had been stolen
              C. had been broken into, stolen
              D. has been broken into, stolen
              难度：中等
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            • 5． Experiments of this kind ____in both the U．S and Europe well before the Second World War．（　　）
              A．have conducted
              B．have been conducted
              C．had conducted
              D．had been conducted
              难度：较易
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            • 6．
              ____ many times, but he still couldn't understand.

              A. Having told
              B. He had been told
              C. Though he had been told
              D. Having been told
              难度：中等
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            • 7．
              More than three-fifths of the people caught in the earthquake _____ by the end of last night.

              A. were rescued
              B. had been rescued
              C. had rescued
              D. have rescued
              难度：中等
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            • 8．
              ______ many times, but he still couldn't understand it.

              A. Though he had been told
              B. Having been told
              C. Having told
              D. He had been told

              难度：中等
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            • 9．
              John had to have his car repaired in a garage because it ____ seriously.

              A. damaged
              B. was being damaged
              C. had damaged
              D. had been damaged
              难度：中等
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            • 10． Last night’s 9TV news said that by then the death of the missing people     （未证实）yet．（prove）
              难度：中等
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