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The subjects were given quadruple the normal dosage of the d

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The subjects were given quadruple the normal dosage of the drug. 请教这句为何在were given 后加adj?
已查过quadruple只有adj、v,这句出自longman的quadruple词条
只要明白这句话的原本组成就能理解了：
“The subjects were given quadruple the normal dosage of the drug.”
是从简单而变成复杂的过程：
1.The subjects were given the drug.（被测试的主体被喂食、注射了药剂）
2.The subjects were given the normal dosage of the drug.
（被测试的主体被喂食、注射了正常分量的药剂）
3.The subjects were given quadruple the normal dosage of the drug.
（被测试的主体被喂食、注射了相当于四分之一正常分量的药剂）
所以,quadruple 是用作形容药剂的分量的,不是用来支持动词 were given 的.
希望说的明白,
再问： 那请问有没有be+done+adj的结构的？
再答： 不好意思，我不是天天上网。 如果按文法的话，应该没有 “be+done+adj“ 的固定结构， 但是在写作或说话时候，是可以这样运用的。只不过所用的形容词是形容随后的物件、名词，而不是拿来形容前面的 “be+done“ 组合。 举例：The boy was given substantial amount of money by his uncle. (那个男孩的叔叔给了他大量的金钱。) 所用的 substantial 是形容词，但是 是用作形容后面的 amount 的。 基本上，比较通用的做法是 “be+done+adv“，副词是可以放在后面的。也是会经常看到的。 希望解释的够清楚。 ”
The subjects were given quadruple the normal dosage of the d 翻译：How many of the subjects are science subjects? Explain the summation stability of normal distribution. the three properties of a normal distribution the atoms of given element 1 If Azman were given the choice of doing the laundry or a m Of all the subjects,I like p_____best. the given 英语难题D.Fill in the blanks with the correct forms of the given Students were a___ to choose the subjects that interest them The _____people in the traffic accident were given first aid The residents___had been damaged by the fire were given help