they spent a couple of days and nights on the farm of what would be considered a poor family.
问题描述：
they spent a couple of days and nights on the farm of what would be considered a poor family.
为什么用what而不用which表介词＋which用法
答
what连接前后两个部分,既是of的宾语,也引导后面的句子如果是which只能起其中的一个作用,which引导从句的话前面需要有先行词句子可以改为they spent a couple of days and nights on the farm of the situation（可以...你的意思是说:如果用of which, 那么先行词应该是farm,那么这句话的意思就变了，而是变成了XX农场．可以这么说，但如果这样，此句话的意思就不合理了