It was some time _____ Tony realized that he had made a serious mistake on that matter.
A. since B. before
C. when D. that
B
【解析】
試題分析：句意：過了一段時間以后，托尼才意識到他在這件事情上犯了多么嚴(yán)重的錯誤。It was或will be+一段時間+ before時間狀語從句“過多久才”； “It’s / It has been + 一段時間 + since 時間狀語從句”，譯作“自從…以來, 已經(jīng)…(時間)了”。如 It’s / has been three months since he moved to this city. 要求：主句的謂v.用一般現(xiàn)在時或現(xiàn)在完成時；從句的謂v.用一般過去時，而且須是終止性動詞。It is /was+時間點+when ；It is /was+表示時間的介詞短語+that是強調(diào)句型。根據(jù)題中所給was +一段時間，故選B 。
考點：考查虛擬語氣
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