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几个英语问题(高一英语必修二)

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几个英语问题(高一英语必修二)
新概念英语第三册里Lesson 23有一句话,Acting on sudden impulse,I collected several dozen,put them in a paper bag,and took them to Robert.   several不是后面要用复数吗?那为什么不是dozens?
还有高一英语必修2里“琥珀屋”有这样一句话This gift was the Amber Room,which was given this name because several tons of amber were used to make it.   amber不可数,那么前面不管加多少修饰的,都要用单数啊!那为什么这里用了“were”?
 
dozen 是数词,和hundred 一样,不用加s
除非是dozens of hundreds of
several tons of amber 因为前面的这个限定了
和some of the food are vegetables 一样的