题目内容

None of them knew what had happened _________ I told them about it.    
A.when B.until C.afterD.though
B

试题分析:when当……时;until直到……才;after在……之后;though虽然,尽管。直到我们告诉他们,他们在知道发生了什么事。短语not……until直到才,本句中none表示否定含义,故选B.
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