Prices are double what they were two years ago.价格是两年前的两倍
请问what引导是是什么从句? what they were这个应该怎么翻译呢?
网友的句子与这个句子结构相同:The value of the house is double what it was. 这幢房子的价值比原来翻了一番。(《朗文当代高级英语辞典》第6版p.748)