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英语的武林高手莱鸟有问题 SOS啊

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英语的武林高手莱鸟有问题 SOS啊
1 On one hand, you've studied very hard,but____,you have not learned as much as you need.
A.on other hand B. however
C.in my opinion D.on the other hand 答案为什么选D啊?
2 He's read extensively and___firm foundations for future research.
A laid B lay C lain D lie 为什么啊?选A啊
3. you should____what you are doing ..为什么选B为什么不是D
A become concentrated B concentrate on
C need all your concentration on D pay concentration on
4 These are my ___shoes ,not my best ones.
A every day B everyday C each day D everyday's为什么选B?
英语的武林高手莱鸟有问题 SOS啊
1.固定搭配:on one hand,.,on the other hand :一方面,……另一方面
2.lay foundations for...:为什么打好基础
动词原型lay的过去分词是aid,动词原型不是lie
3.concentrate on...是固定搭配,我们不用pay concentration on ,不像visit,我们可以说:pay a visit to或者make a visit to
4.everyday
a.每天的,日常的,平常的
A、c均为短语,不能放在名词前修饰.D画蛇添足