题目内容
None of them knew what had happened _________ I told them about it.
| A．when | B．until | C．after | D．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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