None of them knew what had happened _________ I told them about it.    

A．when B．until C．a(chǎn)fter D．though

B

解析試題分析：when當(dāng)……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.
考點：考查連詞

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