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
E. up to double the West German Expenditure
答案为A， 很对称。 但D错在哪里？
如有可能，能分析一下 twice 和 double 的用法区别吗？谢啦！！！
West Germans的句中成分变了吧
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