As of this morning, none of my friends have been able to solve the puzzle contained in last week's newspaper.
(A) none of my friends have been able to solve
(B) none of my friends was able to solve
(C) not one of my friends has yet been able to solve
(D) none of my friends has been able to solve
(E) nobody among my friends have solved
E is clearly wrong answer choice.
Remember, "none of + Plural noun" can take either a singular or a plural verb form. => So, in this sentence, A has equal opportunity to D. So, I will eliminate both two. The same reason as choice B.
"Not one" is always singular. Furthermore, choice C contains "yet" is the key word for my choice, indicating that the present perfect is necessary. "Yet" makes the tense of sentence is clear
What is the OA?
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CR: Focus of the Week: Must be True Question