It is a common sense that new ideas have to be tested many times before ___A being fully acceptedB fully acceptedbefore 后不能省略吗?

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It is a common sense that new ideas have to be tested many times before ___A being fully acceptedB fully acceptedbefore 后不能省略吗?

It is a common sense that new ideas have to be tested many times before ___A being fully acceptedB fully acceptedbefore 后不能省略吗?
It is a common sense that new ideas have to be tested many times before ___
A being fully accepted
B fully accepted
before 后不能省略吗?

It is a common sense that new ideas have to be tested many times before ___A being fully acceptedB fully acceptedbefore 后不能省略吗?
A. 新想法在被接受之前要经过多次检验,这是常识.
before是介词,后面要用动名词结构的.这里还有个被动的关系在里面.因此不用A而选择B.
作连词的话B选项应该是they're fully accepted (by people)
语法上可以把before以及before后面的全部去掉,但是句意有点不完整了.

B项是对的,因为在状语从句中如果主从句主语一致的话,可以将从句主语省略,如果有be动词的话要一起省去,所以选B。