It was some time I realised the fact that life had become difficult for many villages in

问题补充：

It was some time I realised the fact that life had become difficult for many villages in western Europe.

A. until

B. before

C. unless

D. since

答案：

A. until

B. before

C. unless

D. since

解析：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。