Read the passage and choose the best word for the blank. "The scientist's discovery was so _______ that it challenged everything researchers had believed about the subject for the past fifty years."
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Worked Solution
Step 1: Read the context — the discovery 'challenged everything researchers had believed for fifty years'.
Step 2: A discovery that overturns half a century of established belief must be exceptionally significant and new.
Step 3: 'Groundbreaking' means pioneering or revolutionary — it literally 'breaks new ground' in a field.
Answer: groundbreaking
Correct answer: groundbreaking
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