New ideas sometimes have to wait for years before _____ .   

    A. fully accepted                                    B. having fully accepted

    C. fully accepting                             D. being fully accepted

D


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，所以要用被動(dòng)形式，故Ｄ選項(xiàng)正確．

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