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

85

percent

of

the

cases

of

blindness

in

that

place

are

prevented

by

the

orbis.

那個地方大約85%的失明病例/狀況得到了國際奧比斯組織的有效預防。

含有分數時謂語要跟of

後的名詞保持壹致，因為the

cases是復數，又是介紹現在的狀況，所以用壹般現在時的被動語態，故選A.are

prevented.