i don't know when_____famous A.does he become B.he becomes C.did he become D.he become答案是B还是D呢,太纠结,顺便问一下C中助动词为什么不能加,陈述语序不能加助动词吗?

we don't know when___(leave) I don't know. “i don't know you know i don't know 问几道初三英语题(说下理由)1.I don't know if she___,if she___,please let me knowA.comes,comes B.will come,will comeC.comes,will come D.will come,comes2.I don't knowwhen he___.When___,I'll let you know.A.comes,comes B.will come,comesC.comes sorry,I don't know. i don`t know much I don't really know. 英语；I don't know I don't know miss I don't know him. I don't know now 翻译 i don't know So know,I don't I don't know her i don't know anything I know enough to know that I don't know i don't know what i I don't think I know you