标题: OG12 71 [打印本页] 作者: EEEEErica 时间: 2011-11-8 15:49 标题: OG12 71 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 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
The correct answer is D
B为什么错？OG解释说是 in turn an activation of 那部分不完整。。
OG解释说D那里是有个隐藏的to，就是exhibit and thereby (to) activate,不理解。。
谢谢~作者: 槡树 时间: 2011-11-8 16:19
B答案突然加了一个 in turn进来 错了吧？ D答案是唯一没有添加的答案，而且是简单句。
请NN回答 OG解释说D那里是有个隐藏的to，就是exhibit and thereby (to) activate,
可以解释一下为什么acticate前面的to可以省略不写么？到底什么情况下在and之后可以省略主语和be动词还有to之类的东东啊？好混乱！！谢谢啦！