The costs of higher education,as well as poor preparation for college,___many minority students,experts say.A are holding back B holds back C have been held back D has held back麻烦说明一下原因.

The costs of higher education,as well as poor preparation for college,___many minority students,experts say.A are holding back B holds back C have been held back D has held back麻烦说明一下原因.
The costs of higher education,as well as poor preparation for college,___
many minority students,experts say.
A are holding back B holds back C have been held back D has held back
麻烦说明一下原因.

The costs of higher education,as well as poor preparation for college,___many minority students,experts say.A are holding back B holds back C have been held back D has held back麻烦说明一下原因.
A.翻译：高等教育的费用以及对大学的并不充分的准备正在阻碍许多少数民族学生,专家说到.首先,hold back在这道题中的意思是“阻碍”,其次B,D我认为与作者谈到这句话时的意思不符.C项,本人认为,如果改为have been holding back则可以考虑选择.