下面的是一道高考考试题，2011年的陕西卷考试试题：
▲I walked up to the TOP of the hill with my friend, ______ we enjoyed a splendid view of the lake.
A. which B. where C. who D. that
此题答案是 B，这个好理解，由于定语从句的主语、谓语和宾语是完整的，不缺主语或宾语，所以不可以选关系代词 which, who 或 that，故排除 B、C 和 D。另外，that不可以引导非限制性定语从句，据此也可排除 D。
▲我的问题是：这里为何不需要 from where 呢？应该是从山顶去看吧，为何不需要 from where 呢？请专家老师帮我解决两个问题：一是这里能否用 from where？二是，假如可以用 from where，那它与单独用的 where 有什么不同？
刚刚找到了我以前给学生说过的课件，摘录给你，以更好地理解。
1. where 意思是在某处，指地址，较模糊。
2. from where 意思从某处（等于from+介词+which），比用where一个词看上去更具体，愈加形象生动，且符合英语习惯。
比如：
We climbed up to the TOP of the hill, from where we had a good view. 大家爬到了一座山顶，从山顶上看到美妙的风景。
=We climbed up to the TOP of the hill, from on TOP of which we had a good view.
=We climbed up to the TOP of the hill and from on TOP of the hill we had a good view.
分析：加上from是表示方向感的，在这儿表示登高而远望的意思，假如没了from，就没这种感觉了。假如去掉from：
We climbed up to the TOP of the hill, where we had fantastic views. 大家爬到了一座山顶，在山顶上大家看到了美妙的风景。
再例：
He hid himself in a tree, from where he could see the enemy in the distance. 他躲在一棵树上，从那儿他可以看到远处的敌人。
= He hid himself in a tree, from in which he could see the enemy in the distance.
= He hid himself in a tree, and from in the tree he could see the enemy in the distance.
分析：用from where把躲在树上窥视的动作表现得愈加生动、形象，直接用where不具体，不形象。
