Only a tenth of the blind (find)__a guide dog useful.

问题描述:

Only a tenth of the blind (find)__a guide dog useful.
主谓一致,请问上面是怎么填才好,谢谢各位解释下!

the blind代表盲人这一类人,是复数概念,即使是a tenth也是复数,所以应该用find