English Language · English
Identify the grammatical error and rectify the given sentence by choosing the correct option. 'By the end of this year, the research team work on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.'
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1By the end of this year, the research team will have been working on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.✓
- 2By the end of this year, the research team will work on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.
- 3By the end of this year, the research team will have worked on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.
- 4By the end of this year, the research team will be working on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.
Correct answer
By the end of this year, the research team will have been working on the vaccine for over two years, ensuring every trial phase is thoroughly evaluated.
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