No one knows exactly ______ this important discovery was made.
A．that　　　B．that how 　　C．what 　　D．when
D
考查名詞性從句。when什么時候，句意：沒有人確切的知道什么時候發(fā)現(xiàn)這個重要的發(fā)現(xiàn)。
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