It is re ported that the United States uses _____ energy as the whole of Europe.     
A．a(chǎn)s twiceB．twice muchC．twice much asD．twice as much
D
表示倍數(shù)的twice(兩倍)要放在第一個as前，即“倍數(shù)+as+形容詞(+名詞)+as”。故選D。
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