Many experts hold the view ____protection awareness is ____ the key to better environment lies.
问题描述：
Many experts hold the view ____protection awareness is ____ the key to better environment lies.
答案是that,where.为什么第二个空不能填in which?
答
protection awareness is the thing in which the key lies...你自己看吧,如果使用in which 都不知道这个which是指得什么东西...where = the thing/place in whichis后面不是一个表语从句吗，从句缺地点状语，不是这样嘛？》你问的是为什么不能用in which... in which就意味着which 会指代一个东西，这样才能in 那个东西. 对不？那么is a place in which the key lies. where可以当 the thing where使用, 当相于是一个定语从句，省略了指代物.