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It was some time _____ I realised the fact that life had become difficult for many villages in western Europe.
A.untilB.beforeC.unlessD.since

试题分析:句意:过了一段时间,我才意识到对西欧的许多村庄来说,生活已经变得很艰难。It was/will be + 一段时间 + before引导的时间状语从句,是一个固定句型,意为:过了多长时间才……/要过多长时间才会……。此句型容易与it is +一段时间+since从句混淆,注意,before的那个句型中,it后面用的是一般过去时或一般将来时,而since的这个句型中,it后面用的是一般现在时或现在完成时,意:自从since从句中的那个动作发生以来至现在的时间是多久。
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