About 85% of per cent of the cases of blindness in that place buy the orbis A are prevent

About

85

percent

of

the

cases

of

blindness

in

that

place

are

prevented

by

the

orbis.

那个地方大约85%的失明病例/状况得到了国际奥比斯组织的有效预防。

含有分数时谓语要跟of

后的名词保持一致，因为the

cases是复数，又是介绍现在的状况，所以用一般现在时的被动语态，故选A.are

prevented.