no one knows exactly ___ this important discovery was made.
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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
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.](/uploads/image/z/5332357-37-7.jpg?t=no+one+knows+exactly+___+this+important+discovery+was+made.)
因为是was所以,要用or连接
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I'm afraid that no one knows ___.
No one knows
No One Knows 歌词
No one knows( )
No one knows [ ]
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-- that they had made an important discovery in science.