OGP720,71题

小濛嘎

OGP720,71题
请问，（句子，which、、、、）这里which 引导非限定性定语从句， 我记得可以指代前面的句子。为什么在语法题中，只要指代前面的句子就错。难道在gmat考试中，which只能指代前面的词，不能指代句子？
Unlike the original National Museum of Science and Technology in Italy, where the models are encased in glass or operated only by staff members, the Virtual Leonardo Project, an online version of the museum, encourages visitors to "touch" each exhibit, which thereby activates the animated functions of the piece.
A) exhibit, which thereby activates   个人迷惑在这里，因为模糊记得非限定定语从句中which可以指代前一个句子，到底什么时候能只带句子，什么时候能指代词？？？？  这里翻译也还通顺啊  “这个博物馆鼓励人们触摸每个展品，这样可以activates、、、、、”
B)exhibit, in turn an activation of
C)exhibit, and it will activate
D) exhibit and thereby activate  
E)exhibit which, as a result, activates      
答案说AE的which在句子中没有先行词      选D
which到底能不能指句子，什么情况下？？？？？
望解决！！！！！！！！！！

mslancaster

which必须有先行词，而不能指代整句

同理，it也不能指代整句