When and why you came ____ .

When and why you came ____ . 一道英语单选题.-How and why Jack came to China ____ not known .When when and why he came here _____ yet. When and why he came here ________ yet.选什么 What ____ you ____(do) when I came in? He ()when you came. When and why he came here () yet?A is not known B are not kn When and why he came here ________ yet.A.is not known B.are When and why he came here ___ yet 为什么横线上的谓语动词用单数 请英语帝,讲解这道题when and why he came here _______yet.a\is not know When is the last time you cried and why? Why don't you come and sit next to me=You ____ ____ come and