问题
13About 90 percent of the equipment presented by the administration，as well as the facilities ofour own，______made good use of in teaching
A:are；have attended；don’t turn up
B:is；have attended；haven’t turned
C:is；attend；haven’t turned up
D:are；attend；don’t turn up
B:is；have attended；haven’t turned
C:is；attend；haven’t turned up
D:are；attend；don’t turn up
正确答案是：
