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            • 1．

              In the past few days the professor along with his assistants _______ on the project day and night to meet the deadline.

              A．has been working     
              B．were working             
              C．have been working    
              D．was working
              难度：中等
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            • 2．

              In order to find the missing boy, villagers along with his mother _________ all they can over the past five hours.

              A．has done
              B．are doing
              C．had done
              D．have been doing
              难度：较难
              解析 收藏 试题篮
            • 3． That baby________nonstop for the past hour．（　　）
              A．cried．
              B．was crying．
              C．is crying．
              D．has been crying．
              难度：易
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