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Select the most appropriate articles to fill in the blanks. After years of research, the team developed effective vaccine for the virus, marking historic moment in medical science.

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1a; an
2a; a
3an; an
4an; a✓

Correct answer

an; a

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Select the most appropriate articles to fill in the blanks. After years of research, the team developed ____ effective vaccine for the virus, marking ____ historic moment in medical science.

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Select the most appropriate articles to fill in the blanks. After years of research, the team developed effective vaccine for the virus, marking historic moment in medical science.