It was some time Tony realized that he had made a serious mistake on that matter.A. since B. beforeC. when D. that 题目和参考答案——青夏教育精英家教网—

It was some time _____ Tony realized that he had made a serious mistake on that matter.

A. since B. before

C. when D. that

【解析】

试题分析：句意：过了一段时间以后，托尼才意识到他在这件事情上犯了多么严重的错误。It was或will be+一段时间+ before时间状语从句“过多久才”； “It’s / It has been + 一段时间 + since 时间状语从句”，译作“自从…以来, 已经…(时间)了”。如 It’s / has been three months since he moved to this city. 要求：主句的谓v.用一般现在时或现在完成时；从句的谓v.用一般过去时，而且须是终止性动词。It is /was+时间点+when ；It is /was+表示时间的介词短语+that是强调句型。根据题中所给was +一段时间，故选B 。

考点：考查虚拟语气

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