dig up a problem 为什么不能是dig into a problem

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• They discussed the problem three or four times,but could come to no (end?).They discussed the problem three or four times,but could come to no ().选项:a、a.end b、 b.conclusion c、 c.result d、 d.judgment搞不清楚答案为什么是这个呀，能不能提醒一下？
• 几道德语问题1. Dem Fussgaenger wird von den Passanten geholfen.为什么要用第三格? 不能直接说der Fussgaenger?2.Ich weiss nicht,ob das Problem schon …… 为什么选 hat geloest werden muessen 这个语序到底是怎么样的?
• Well,let’s put our heads together and find (an answer?) to the problem.Well,let’s put our heads together and find () to the problem.选项:a、a.an answer b、 b.a way c、 c.a solution d、 d.a method搞不清楚答案为什么是这个呀，能不能提醒一下？
• 35.Every possible means _____ to work out the problem,but it is too difficult for us.A.is used B.are used C.has been used D.have been used答案为什么是C?26.If you go on doing that kind of foolish things,you will ______ in *.A.bring up B.end up C.take up D.come up答案为什么是D?36.The first Olympics in modern times _______ in 1896A.was taken place B.were held C.was held D.were happened为什么选B不选C?2.
• He_________a good idea to solve the problem.中文提示:他已想出一个解决这个问题的好主意.答案给的是has come up ,为什么不能有had come up
• 是用动名词还是动词不定式working(to work) out the math problem like this题目是Did you have difficulty in study?Yes,____ out the math problem like this.C.working D.to work1,为什么不能用动词不定式2.动词不定式放句首也是作主语吗?3.如何判断一个句子中,动名词放句首,还是动词不定式放句首
• 改同义句：At last,children came up with a good solution to the problem.At last,children _____ _____ a good solution to the problem.答案填thought up,请问能不能填thought out?为什么?
• He always _____(come up with) good solutions to his friend's problem.答案是comes up with为什么不是coming up with,不是有一个词组是always doing
• He____________a good idea to solve the problem.中文提示是：他已想出一个解决这个问题的好主意.想知道为什么答案是has come up
• 初中英语的几个句子问题This is so difficult a problem that few of us can work it out.(为什么要有a,可不可以so difficult a换成such)Fran,with his two sisters,is leaving for London by train which leaves at 8:00 next morning,（为什么用这样的时态）Great changes have taken piace in our province.Many tall buildings have been set up.(为什么是这样的时态）Roller-skating is a sport that people of all ages can enjoy.(为什么用that,不可以what)Sam is my best friend whose father is very tall.(为什么是whose,最后再给我说说,做这种题的技巧
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• 1 检验自来水中的CL离子.2 鉴别食盐和纯碱.3 探究鸡蛋壳是否含有碳酸盐.4 除去热水瓶中的水垢.