Where they come from,where should they return

Where they come from,where should they return where are they come from为什么不对? where are they come from?有一处病句 where do they come from?同意句 Where do they come from?What do they usually do Where do they come from? 怎样改成Where ＿＿ they ＿＿ ＿＿? 他们来自哪里?Where do they come from?为什么是where do 而不是where are 英语翻译再请教Where are they come from? Where()lions come from?I think they come from Africa.A.are B 一道英语填空题,Where do the ________（蔬菜）come from?They come from Gu regardless of who they are or where they come from,can make 从这两个句子中总结来自哪里的短语where do they come from?= where are they fro