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            • 1．
              The girl is so helpful that she devoted all her spare time she had ______ others．（　　）
              A．to help
              B．helping
              C．to helping
              D．helped
              难度：难
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            • 2．

              当你想知道怎样才能保持好心情时，你可以这么问

              _____________________________________________________________?

              难度：难
              解析 收藏 试题篮
            • 3．

              I often hear him ________ in the office. Yesterday when I came in, I heard him_________ .

              A．to sing; is singing
              B．to sing; singing
              C．sing; was singing
              D．sing; singing
              难度：难
              解析 收藏 试题篮
            • 4．

              前几天他太忙，没有陪他的儿子一起锻炼。

              难度：难
              解析 收藏 试题篮
            • 5．

              That’s why it is important to learn a second language.

              ____________________________________________________________________________

              难度：难
              解析 收藏 试题篮
            • 6．

              We should stop the pollution _____ the environment .

              A．to improve
              B．from improving
              C．to improving
              D．improve
              难度：难
              解析 收藏 试题篮
            • 7．

              Remember__________ (buy) a book this afternoon, please.

              难度：难
              解析 收藏 试题篮
            • 8．

              Would you like _______(come) to my party ?

              难度：难
              解析 收藏 试题篮
            • 9．
              The water in the swimming pool isn"t warm enough for the children_．（　　）
              A．to swim
              B．to swimming
              C．to swim in
              D．to swimming in
              难度：难
              解析 收藏 试题篮
            • 10．
              We should do what we can________English?

                  

              A．to practice to speak                     
              B．to practice speaking
              C．practice speaking                       
              D．practice to speak
              难度：难
              解析 收藏 试题篮
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