had it not been for their help,we wouldn't have succeeded为什么句子开头用had it not been for

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• （1）If什么时候意思表示“是否”?（2）L didn’t know.Where will he go = L didn’t know Where he would go .为什么用would?（3）Here is _____ order ,All of you must obey it.(4) We watch the opening ceremong pf the World Expo on TV ______ last night.(5)TOM would go to vist his grandparnts if he had free time on Sunday.为什么用would?(6) Have you ever been in a maglev tarin 为什么用in
• 关于完成与过去时态的问题句子：(1)I didn't realize what disaster I had brought to you until I had checked out what had heppened.(2)I have been working in Shenzhen for four years since I gruduated from university.我的疑问：1,在第（1）句中,until后为什么用的的是过去完成时I had checked out而不是过去时I checked out?2,在第（2）句中,since后为什么用的不是过去完成时I had grduated而是I graduated呢?其实我就是不懂过去时与过去完成时的用法,常常搞混.
• We could not have succeeded _____ your help.A.but for B.without C.if it had not been for D.allWe could not have succeeded _____ your help.A.but for B.without C.if it had not been for D.all the above 为什么选D而不是B。翻译？
• If it ___ for the help of our teacher ,we would not have made so much progress.A were not B has not been C isn't D had not been为什么
• had it not been for their help,we wouldn't have succeeded为什么句子开头用had it not been for
• ____for your help,we wouldn't have succeeded.A,Hadn't it been B,Had it not been C,If it had been D,If it were但是A和B的区别在哪儿?
• had it not been for their help,we wouldn't have succeeded为什么句子开头用had it not been for
• ______their help,we wouldn’t have succeeded.A.Hadn’t been for B.Had it not been for C.It hadn’t been for D.Hadn’t it been for
• The boy was angry_____himself for having made such a foolish mistake.选at 还是with答案是with 可是我觉得at也对的啊 是不是答案错了啊
• many thanks for your help.这个句子常常用,但就是不知道是否算一个句子,没有动词算句子吗?这叫什么类型的句子?