None of us new what had happened_____they told us about it.Awhen B until Cafter Dbefore

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Noneofusnewwhathadhappened_____theytoldusaboutit.AwhenBuntilCafterDbeforeNoneofusnewwhathadhappened_

None of us new what had happened_____they told us about it.Awhen B until Cafter Dbefore
None of us new what had happened_____they told us about it.Awhen B until Cafter Dbefore

None of us new what had happened_____they told us about it.Awhen B until Cafter Dbefore
答案是B
语法:
not-- -until -- - -
none是否定词,裏面包含:not any,所以:not -- - - until - - --

B
until:直到什么什么时候才。
翻译:直到他们告诉我们这件事是我们才了解。