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            • 1． ______a certain doubt among the people as to the practical value of the project．（　　）
              A．It has
              B．They have
              C．It remains
              D．There remains
              难度：难
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            • 2．

              Without UN Goodwill Ambassadors, people working on the projects would not be encouraged.

              If _______ _______ _______UN Goodwill Ambassadors, people working on the projects would not be encouraged.

              难度：难
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