English Language · English
Choose the correct interrogative form of the following sentence: 'Copper aids in the formation of red blood cells.'
- 1Has copper aided in the formation of red blood cells?
- 2Does copper aid in the formation of red blood cells?✓
- 3Is copper aiding in the formation of red blood cells?
- 4Do copper aid in the formation of red blood cells?
Correct answer
Does copper aid in the formation of red blood cells?
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