When and why he came here ____ yet.A.is not known B.has not been known并说明原因谢谢
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 05:23:16
![When and why he came here ____ yet.A.is not known B.has not been known并说明原因谢谢](/uploads/image/z/7385364-36-4.jpg?t=When+and+why+he+came+here+____+yet.A.is+not+known+B.has+not+been+known%E5%B9%B6%E8%AF%B4%E6%98%8E%E5%8E%9F%E5%9B%A0%E8%B0%A2%E8%B0%A2)
When and why he came here ____ yet.A.is not known B.has not been known并说明原因谢谢
When and why he came here ____ yet.
A.is not known B.has not been known
并说明原因谢谢
When and why he came here ____ yet.A.is not known B.has not been known并说明原因谢谢
b
因为yet是完成时的标志
而且when and why 表示一个整体概念,所以谓语单数
b
选B
yet用于完成时
根据意思是:他何时、为什么来这里还没有人知道
很难解释,你还是去国外呆几年吧