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(dāng)……時(shí)；until直到……才；after在……之后；though雖然，盡管。直到我們告訴他們，他們?cè)谥腊l(fā)生了什么事。短語(yǔ)not……until直到才，本句中none表示否定含義，故選B.
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