when and why he came here _____ yet.A.is not knownB.are not knownC.has not known

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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,为什么不是用完成式
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• When and why he came here ________ yet.A.is not known B.are not known C.has not known D.have nWhen and why he came here ________ yet.A.is not known B.are not known C.has not known D.have not been那个正确,为什么
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• when and why he came here _____not known yet .为什么填is?（is为标准答案）
• 1:a,minute,can,come,here,you,bob,for 2:in,she,is,office,her 3:she,letter,can,me,this,type,for4:she,of,course,can连词成句
• she was late for he english class this morning.how come?,he never came this morning怎么翻译how come?as far as i konw......