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Define this please

It wasn't until around Christmas time that the experiments changed.

What does this sentence mean?


  • Does it mean that until Christmas experiments haven't changed?

  • The writer is concentrating on the period when the experiments didn't change. This is because he or she wants to make a contrast. By using the words 'it wasn't until' he or she is implying that the right time to change the experiments was in that period. But the experiments weren't changed.

    Yes, they were finally changed, but not at the time the writer expected. No, the experimenters kept them up until some time around Christmas. Then, and only then, they changed. But, in the writer's opinion, they should have changed earlier.

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