New ideas have to wait for years before ( ).

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New ideas have to wait for years before ( ).
Afully accepting.Bbeing fully accepted
Cfully accepted D.to fully accept
我们老师说答案选B ,我觉得是选C.个人感学这句是状从的省略,但老师说before是介词后面用动名词.before可以做连词,但是她说做连词比作介词复杂,要选比较简单的就选B.我真不理解这种说法,那位大大可以帮我解释为什么不选C
这是北京4中上的原题,上面选的是fully accepted

问题补充：
http://web.etiantian.com/staticpages/study/question/question_2851329.htm
这是北京4中上的原题,上面选的是fully accepted 何解?
"A是正被接受,不符句义. "
这里他讲错了.因为他把before当成连词了,其实,介词也说得通.
具体我已经解释过了.
Bbeing fully accepted
对————————虽然讲得通,但个人不喜欢.
因为这种结构,我一直当连词处理.
介词短语,个人不喜欢..
Cfully accepted
New ideas have to wait for years before (they are )fully accepted.
这种完整句子,很显然,体现出了将来时（主将从现）.
但如果用：Cfully accepted 就没有这种感觉了.
B对于动作性,和将来的时间,都有体现.
所以,C是对的,但感觉上对于时态,就没有体现了.
总的来说,B更好.

New ideas have to wait for years before ( ). New ideas sometimes have to wait for years before ( ). New ideas sometimes have to wait for years before they are__ 一道高中英语题目New ideas sometimes have to wait for years before __ new ideas sometimes have to wait for years before fully acce New ideas sometimes have to wait a long time _B__. Sometimes new ideas have to be tested many times before ____ For years Jones kept--up with new and good ideas.A.to come B We have to wait for 20 minutes ( ) paying the money A.before have ideas for 还是have ideas of My parents have been to New Zealand for three years.改错 we should never wait for the door to open before