New ideas sometimes have to wait for years before .
A. fully accepted
B. having fully accepted
C. fully accepting
D. being fully accepted
网友回答
A. fully accepted
B. having fully accepted
C. fully accepting
(答案→)D. being fully accepted
解析：新思想往往要到若干年后才能被完全接受．新思想是被接受的，所以要用被动形式，故Ｄ选项正确．