up to用法疑问——大全补充107

107. American productivity is declining in relation to Europe’s; the energy expended per unit of production in the United States is as much as twice that expended in West Germany.

(A) as much as twice that expended in West Germany

(B) as much as twice that of West Germany’s expenditure

(C) up to two times of West Germany’s expenditure

(D) up to two times what West Germans expended（A）

(E) up to double the West German expenditure

E选项为什么不对？up to的用法有哪些特殊的？谢谢大家指导

up to是介词短语，后面应该跟名词，而不能构成不定式。另外就是up to不用作比较

谢谢