Grammatically Correct: The writer's essential guide to punctuation ...

GRAMMATICALLY CORRECT
construction sounds a bit pedantic. And in certain cases it can be
taken to mean not any, which could be associated with either a
singular or a plural. Thus, the decision as to how to treat it depends
partly on whether a singular or a plural notion predominates, and
partly on how formal a tone you wish to achieve.
The candidates seem interchangeable; none stands out as the best
leader.
[not one; verb is singular]
None but the foolhardy eat at this place.
[not any; verb is plural]
None of these options~ satisfactory.
None of these options are satisfactory.
[singular form is more correct, but plural form is acceptable]
PROBLEM PHRASES
When it comes to subject-verb agreement, certain phrases cause
more than their share of confusion. Some particularly troublesome
ones are one of, the only one of, more than one, one or more, one
in . .. [a certain number], a number of and the number of (Not
surprisingly, these problem wordings all have something to do with
notions of singularity or plurality.)
Exercise
In the following, which of the verbs in parentheses is correct?
Horatio is one of those people who (is, are) late for everything.
Albertine is the only one of the guests who (needs, need) a lift.
As the witnesses filed out, more than one (was, were) overcome by
emotion.
Included with each set (is, are) one or more evaluation forms.
It is estimated that one in four adults (has, have) difficulty reading.
A number of students (has, have) already registered.
The number of cases (was, were) surprising.
Answers
Horatio is one of those people who are late for everything.
The key to understanding this undeniably tricky construction is to
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