Grammar ! one more time

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1

<p>i think that this question has got an error but the PR 11 practice tests claims that it doesn't so can anybody tell me whether im wrong or right?</p>

<p>Not one of the doctors who is treating my sister knows exactly what is wrong with her . </p>

<p>i believe that it should be :
Not one of the doctors who are treating my sisters knows exactly what is wrong with her.<br>
( because there is a 'who' whatever is before is determines whether the verb should be singular or plural - thats what i think so please correct me if im wrong)
thanx :)</p>

2

<p><a href="http://wwwnew.towson.edu/ows/pro_antagree.htm%5B/url%5D"&gt;http://wwwnew.towson.edu/ows/pro_antagree.htm&lt;/a&gt;&lt;/p>

<p>One is singular.</p>

3

<p>i guess but this site says something else </p>

<p><a href="http://www.grammarbook.com/grammar/subjectVerbAgree.asp%5B/url%5D"&gt;http://www.grammarbook.com/grammar/subjectVerbAgree.asp&lt;/a>
( rule 13)</p>

4

<p>Take out "of the" which is confusing you:</p>

<p>"Not one doctor who is treating my sister knows exactly what is wrong with her."</p>

<p>"Of the" changes the noun to plural, since it implies that there is more than one, but does not change the verb.</p>