OG 11 - 17题

momoco

17.   None of the attemptsto specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and, conversely, why so many of those not so exposed have

(A)     have
(B)     has
(C)     shall
(D)    do
(E)     could

none of 后面是复数名词，谓语动词不是应该是复数嘛，为什么这里是单数？？
==============================================另一题
大全765 1.The herbicide Oryzalin was still being produced in 1979, three years after the wives of workers producing the chemical in Rensselaer, New York, were found to have borne children with heart defects or miscarriages, and none of their pregnancies was normal.
(A) to have borne children with heart defects or miscarriages, and none of their pregnancies was
(B) to have had children born with heart defects or miscarriages, and none of the pregnancies was
(C) either to have had children with heart defects or miscarriages, without any of their pregnancies being
(D) either to have had miscarriages or to have borne children with heart defects; none of the pregnancieswas（D）
(E) either to have had miscarriages or children born with heart defects, without any of their pregnancies being

longman对pregnancies的解释是  
       preg?nan?cy plural pregnancies [uncountable and countable]
pregnancies是复数，这里为何用was？

另附上longman的none of 的例句
I know what people are saying - but none of it is true.
None of my friends phone me any more.

请多多指教
3X