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        1. None of them knew what had happened _________ I told them about it.    
          A.when B.until C.a(chǎn)fterD.though
          B

          試題分析:when當……時;until直到……才;after在……之后;though雖然,盡管。直到我們告訴他們,他們在知道發(fā)生了什么事。短語not……until直到才,本句中none表示否定含義,故選B.
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