[求助] OG 11-4 句子结构问题

double在这里是副词吧。double是可以做作副词，与twice同样的用法，twice只有副词一种词性，虽然og 11 128中说Today, because of improvements in agricultural technology, the same amount of acreage produces double the apples that it has in 1910.中 Double is used in place of twice;是个错误。但一般语法中，double可以替换twice用（可查薄冰的高级语法）。