一道语法选择题（2001）45.Americans eat ______ as they actually need every day.A.twice as much proteinB.twice protein as much twiceC.twice protein as much D.protein as twice much--我选了A,

这是主谓宾句型中的原级比较句，比主系表句型中的原级比较要难一些。但还是有记忆方法的。 请看由浅入深的句子演示：
I have many books.
I have as many books as Peter does.
I have twice as many books as Peter does.
I have three times as many books as Peter does.
I eat much food.
I eat as much food as Peter does.
I eat twice as much food as Peter does.
I eat three times as much food as Peter does.
如果一样多，比较简单。
二倍以上，结构：主语+谓语（Vt.)+倍数词+as +much/many +名词（作宾语）+ as+比较对象（省略句）

你的答案是正确的。
倍数表达
倍数+形容词比较级+than
倍数+the+名词+of
倍数+as+adj/adv+as
倍数+as much+n+as
倍数+as many+n-s+as
That is, I would charge him twice as much interest as he made by saving.
也就是说，我将按他存款利息的两倍来收取他的贷款利息。
Although it makes some quite good cars, Opel is burdened with twice as many factories as it needs.
尽管欧宝生产了一些相当好的汽车，但它的工厂数量是它需求的两倍。

答案错了 就是选A

表示倍数的方法
A + be + 倍数 + as + 计量形容词原级 + as + B
A + be + 倍数 + 计量形容词比较级 + than + B
A + be + 倍数 + the + 计量名词 + of + B
The + 计量名词 + of + A + be + 倍数 + that + of + B
简单说就是
倍数+as...as
倍数+比较级+than
倍数+the+名词+of
望采纳

扯那么多 .还不如 让楼主 自己 在网上搜.
很简单 twice 后面不能加 不带限定词的名词 所以 选项C 是错误答案
如果 选C 应该是.Americans eat twice the protein that they actually need
正确答案 就是 A.twice as much protein
我认为 楼主 对这个句型 一定 很熟悉 ,无需多讲 .

肯定是c！