【題目】Americans eat ______ vegetables per person today as they did in 1990.
A.more than twice
B.as twice as many
C.twice as many as
D.more than twice as many

【答案】D
【解析】句意：美國(guó)人現(xiàn)在每天吃的蔬菜是1990年的兩倍。倍數(shù)表達(dá)方式：倍數(shù)+as…as…，第一個(gè)as后加形容詞或副詞，第二個(gè)as后加比較對(duì)象，故選D.

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