several weeks ago 换现在完成时,是several weeks before还是for several weeks

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• Several weeks had gone by __ I realized the picture was missing.应该填since,before?why?
• Several weeks had gone by_____the judge realized his abuse of power,这句话为什么不可以...Several weeks had gone by_____the judge realized his abuse of power,这句话为什么不可以填when只可以用before
• 状语从句 Several weeks had gone by _____ I realized the painting was missing.中间的空为什么用before 而不用when?
• Several weeks had gone by ________ realized the painting was missing.A.as B.before C.since D .w此题是哪一年的高考题
• Several weeks had gone by ______ I realized the painting was missing.a、as b、 before c、 since d、 that这题选b,为什么连接词之前有个by?
• Several weeks had gone by ___I realized the paining was missing .6.Several weeks had gone by _b_ I realized the painting was missing.a、as b、 before c、 since d、 that 为什么选b
• 还是一篇作文,帮我看下有没有什么错误的地方或者哪里的语句有更好的改进方法的~Time flies and when I realized it I have already been a sophomore.Looking back into the first year I have spent in the college,I can clearly found that I have really learned very much and grown quickly.I can still remember the first several weeks in the college and they are quite busy and difficult to me.As a college student,I have to learn how to handle the life and work and study well.I know I should learn to do
• 谁有这篇文章,谢谢了several weeks ago the newspaper filled with the story of students at Fujian university who had been poisonedto death by his roommate
• But my teacher had been with me several weeks before I understood that everything has a name.请问各位这句怎么翻译才好,为什么用 before,可以用after
• Several weeks had gone by __ I realized the picture was missing.应该填since,before?why?
• "China is a great country" Tom says改为间接引语Tom says —— china—— a great country.
• The dog was trapped there for two weeks 后面的for two weeks 不是用在现在完成时吗 前面咋是was