When and why he came here ________ yet.选什么When and why he came here ________ yetA.is not known B.are not known C.has not known D.have not known为什么选B不选D?他什么时候,为什么来的都不知道,不是过去来的,为什么不是
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![When and why he came here ________ yet.选什么When and why he came here ________ yetA.is not known B.are not known C.has not known D.have not known为什么选B不选D?他什么时候,为什么来的都不知道,不是过去来的,为什么不是](/uploads/image/z/5700674-2-4.jpg?t=When+and+why+he+came+here+________+yet.%E9%80%89%E4%BB%80%E4%B9%88When+and+why+he+came+here+________+yetA.is+not+known+B.are+not+known+C.has+not+known+D.have+not+known%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89B%E4%B8%8D%E9%80%89D%3F%E4%BB%96%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%2C%E4%B8%BA%E4%BB%80%E4%B9%88%E6%9D%A5%E7%9A%84%E9%83%BD%E4%B8%8D%E7%9F%A5%E9%81%93%2C%E4%B8%8D%E6%98%AF%E8%BF%87%E5%8E%BB%E6%9D%A5%E7%9A%84%2C%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AF)
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