In the A.D.300's, a church was built over _______ was thought to be Saint Perter's Tomb.
In the A.D.300's, a church was built over【what】 was thought to be Saint Perter's Tomb.
应该填what.因为what=the thing which/ that.我问题说了一大堆，其实我是想知道为什么where不可以，where = the place where？？我问题说了一大堆，其实我是想知道为什么where不可以，where = the place where？？where = the place where，但是where是副词，不能做介词over的宾语，也不能做was的主语，你说是吗？where是可以作为关系代词吧，而且在这里用where的话也是关系代词吧？where不能作关系代词，where只能做【关系副词】。