Sometimes new ideas have to be tested many times before ______ . A.accepting fully B.being fully accepted C.fully accept
问题描述：
Sometimes new ideas have to be tested many times before ______ . A.accepting fully B.being fully accepted C.fully accepting D.fully being accepted
答
B 为什么？主语是ideas，此处是被动语态，所以得填be accepted，排除A，C，before是介词，后面的be就得是动名词形式being，fully修饰accepted。