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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：难
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            • 2．
              The flowers don’t need too much water; you can just water them _____.
              A．each other days              
              B．every other day
              C．each of two days             
              D．every of two days
              难度：难
              解析 收藏 试题篮
            • 3． 27. Tony said he would come back to China _________.

              A．tomorrow
              B．next day
              C．the next day
              D．the day before

              难度：难
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