题目

New ideas sometimes have to wait for years before ______. A．being fully accepted                                   B．fully accepting C．having fully accepted                                  D．fully accepted 答案：A 【详解】 考查非谓语动词的语态。句意：新思想有时要到若干年后才能被接受。句中非谓语动词的逻辑主语为New ideas，与非谓语动词为动宾关系，是非谓语动词动作的接受者。Before为介词，介词后要用动名词，所以要用动名词的被动语态。故选A。

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