Where to get the materials and how to get them at the meeting.
A. have not discussed
B. have not been discussed
C. has not discussed
D. has not been discussed
网友回答
A. have not discussed
B. have not been discussed
C. has not discussed
(答案→)D. has not been discussed
解析：两个不定式的动词相同，属于同一概念，所以谓语仍然用单数。