Question

One of the boys _____ told me the truth.

• A. has
• B. is
• C. have
• D. are

Answer 1

Answer:

A. has

The subject of the sentence is “One of the boys” — the main noun is “One”, which is singular.
So, the verb must also be singular.

• One of the boys has told me the truth. ✔️
  (“has” agrees with the singular subject one.)