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            • 1．

              The professor warned the students that on no account________use mobile phones in his class．（ ）

              A．should they
              B．they should

              C．dare they
              D．they dare
              难度：较难
              解析 收藏 试题篮
            • 2．
              Not until recently______ the development of tourists activities related activities in the rural area．（　　）
              A．their had encouraged      
              B．had they encouraged
              C．did they encourage  
              D．they encouraged
              难度：较易
              解析 收藏 试题篮
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