no one knows exactly ___ this important discovery was made.A.that B.that how and when .C.how D.how or when我觉得应该是 how and when,可答案却是D.为什么用or

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nooneknowsexactly___thisimportantdiscoverywasmade.A.thatB.thathowandwhen.C.howD.howorwhen我觉得应该是howan

no one knows exactly ___ this important discovery was made.A.that B.that how and when .C.how D.how or when我觉得应该是 how and when,可答案却是D.为什么用or
no one knows exactly ___ this important discovery was made.
A.that B.that how and when .C.how D.how or when
我觉得应该是 how and when,可答案却是D.为什么用or

no one knows exactly ___ this important discovery was made.A.that B.that how and when .C.how D.how or when我觉得应该是 how and when,可答案却是D.为什么用or
因为是was所以,要用or连接

根据翻译 用or翻译为没有人确切的知道这个重要的发现是怎样或者什么时候发现的。

这是出自《丝绸之路》的原句,应该联系上下文得出来的,题本身不是很好,让很多人都会以为他在考就近原则,如果考be made的be动词的时态就好多了。