need an extra two weeks.这里为什么要在two weeks前加冠词an?不加可以吗?

need an extra two weeks.这里为什么要在two weeks前加冠词an?不加可以吗? “an extra we need two __and___1.tomatoes,one onion 2.tomatoes,an onion 答案上是1,为什么? we shall make an extra model同义句 有没有extra two bowls of rice这种说法?不是只有an extra能与数词连用,比如An extra ten pounds.难道因为米饭不可数? __ honey do we need?two We need two teaspoons of honey.(对two提问) 对划线部分提问:we need two apples(two) 请问是,an extra two thousand pounds,这句话语法有错吗? 请问是,an extra two thousand pounds,这句话语法有错吗? Making an extra effor? Before we dive into the animations,we should look at whether the standard skeleton will provide for our needs.If it will,then we can move straight on to the next step.If it won't then we need to consider if an extra bone would do the trick.It is defi You need to pay an extra half-day of room charge.你需要多付半天房费 这句话对吗 英语翻译(1) Nutrients might be divided into two categories based on the amount that we need.These are the macronutrients (carbohydrates,fats,proteins,and water),which we need in relatively large amounts and the micronutrients (mineral elements an we need two more chairs.(改为同义句） we need ----- -----chairs. we need (two cups)of yogurt对括号里提问 We still need two ___ (many) students to help us. we need two t____of honey to make the shake.