Which word best completes: "The scientist made a ___ discovery that changed medicine."
Answer and explanation
Correct answer: D. groundbreaking
- Step 1: A discovery that changed medicine is a major new finding.
- Step 2: Groundbreaking means innovative and important.
Answer
groundbreaking.
Why not the others: "Groundless" means without reason, and the other two are not adjectives for discoveries.
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