without 的用法是without与后面的名词或是动名词中间不能有任何的插入词如their,any等等都是不可以的.
这是OG在解释57题的原话 In B, the active verb has shifted suggests that the light, not the motion, is the agency of action, but such a construction leaves the phrase by the rapid motion of the galaxy away from the Earth without any logical or grammatical function.
个人观点: 这里必须用which可能还与后面的without being grounded有关。without being grounded里有being,则violent前面也应该有be动词,否则就有些不对称;同时being grounded也与其被修饰语mood swings之间的关系不紧密,导致unclear。而且,介词短语with直接放到形容词violent后面修饰它很awkward
补充: 现在GMAC好像并没有那么的强调distinguish的用法了,OG12-51题中竟然直接用distinguish discrete sounds and words,中间并没有between。在OG12中,GMAC好像改变了很多规则,而且一些出题也没有那么的严密了,在OG11的基础上放宽了很多。