摘要:主句不仅有肯定式.也可有否定式.肯定结构意义为:过多久才.需要多久才,否定结构意义为:不久就-- It was long before they finished their task. 过了很长时间.他们才完成任务. It wasn’t long before the people took up their arms. 不久.人民就开始拿起了武器.

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