一道高二英语语法题it was some time（） we realised the truth选项有 before

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一道高二英语语法题
it was some time（） we realised the truth
选项有 before when since until
谁给仔细说说这几个词我总分不清

BEFORE(在我意识到事情真相之前过了一段时间）考擦状语从句
1.when"当……时",引导时间状语从句时,从句用于表示主句动作发生的特定时间.例如：
The days get longer when spring comes.春天到来时,白天变得更长了.
2.before"在……之前",引导时间状语从句时,表示主句动作发生在从句动作之前.例如：
Close the door before you leave the room.离开房间前关上门.
3.after"在……之后",引导时间状语从句时,表示主句的动作发生在从句的动作之后.例如：
I went to bed after I finished my homework.做完作业后我就去睡觉了.
4.until、till"直到",引导时间状语从句.当主句谓语动词是延续性动词时,主句常用肯定形式；当主句谓语动词是非延续性动词时,主句要用否定形式,即"not ...until / till ..."意为"直到……才……".例如：
I'll wait here until / till he comes back.我将在这里等着,直到他回来.
You can't go home until / till you finish your work.直到你完成你的工作,你才能回家.

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