1.it was some time __ we realized the true

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1.it was some time __ we realized the true
为什么空格处不能填until,我英语比较差麻烦解释一下.为什么was改成is后就不用before而要用since呢?
2.one more hour and i'll finisheded my work.
follow doctor‘s advice and you will be well soon.
为什么两个同是祈使句为什么一个开头没有动词一个有呢?

听好我说的：
第一题;这是一个时间状语从句,既然是从句那么必须有两个动词（英语中一个动词就可以看做是一个句子）,此题如果填before（在.之前）,表示后半句的动作先发生（意识到真相之前,已经过了一段时间了）.,过了一段时间表示过去,所以是was.
如果填since（自从）,表示some time这段是间可能还要延续,所以要用is.
第二题：,（如果一个句子开头式动词原形那他必然是祈使句）,但是祈使句并不是句子开头一定要有动词.祈使句说白了就是表示命令,请求,建议含义的句子,第一句表示请求,第二句表示建议（或命令,看你怎么理解了）.
再问：为什么不用until呢？ until不是有直到的意思么？而且“表示后半句的动作先发生”应该是前半句先发生吧？是先过了一段时间，我才知道真相。

1.it was some time __ we realized the true It was some time ______ we realized the truth.A. It was some time _____ we realized the truth. 问一道英语选择题It was some time _______ we realized the truth.A.whe It was some time later_____we realized the truth. 1.It was some time___we realized the truth it was some time-------- we realied the turth It was o____ true that he hated the fact that some people we ___he realized it was time to go back home. some time it is true,some time is not. It's high time we __ cutting down the rainforests. 一道高二英语语法题it was some time（） we realised the truth选项有 before