A group of archaeologists returned to a site that had been previously examined—Kuk Swamp, which is in a mountain valley in the highlands of what is now Papua New Guinea.
请问老师,这里的what指代什么?what通常可以指代the thing(s) which,所以这里的what指代 the place which吗?这里thing可以灵活指代,那么这个灵活的原则是根据句意吗?比如这里的新几内亚是一个地点,which在定语中做主语,所以主语也是一个地方,那么先行词就用place,请问我这些分析对吗?