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            • 1．
              Now all of our concentration is on __ it is that the global environment will return to normal.

                    

              A．which                     
              B．what                       
              C．where                     
              D．when
              难度：较难
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            • 2． — _________ do you have an English party?

              —Once a month.

              A．How old
              B．How often
              C．How far
              D．How long
              难度：较难
              解析 收藏 试题篮
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