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            • 1．

              If I had had time, I would have run around that lake again.
              ​________ ________ ________ time, I would have run around that lake again.

              难度：中等
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            • 2． The illness will result in total  blindness  if  it is left untreated

              If _____  ________, the illness will result in total blindness

              难度：较难
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