Choose the correct option:
Correct answer: D. Each of the chemical antiseptics was more harmful to the leucocytes than to the germs.
- A. Each of the chemical antiseptics was more harmfully to the leucocytes than to the germs.
- B. Each of the chemical antiseptics was more harmful to the leucocytes then to the germs.
- C. Each of chemical antiseptics were more harmful to the leucocytes than to the germs.
- D. Each of the chemical antiseptics was more harmful to the leucocytes than to the germs.
Explanation
"Each" is singular, so we use "was". The adjective harmful is correct, and than is correctly used for comparison.
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About Subject-Verb Agreement
Subject-verb agreement requires the verb to match the true subject in number and person, even when other words intervene. Questions cover collective nouns, compound subjects, indefinite pronouns, either and neither, relative clauses, quantities and inverted sentences, where proximity can falsely suggest the wrong verb.
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