Sorry,I really don't know______

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Sorry,I really don't know______
A.When your parents and brother will come back
B.When your parents and brother would come back
答案给的是B,但是我选择的是A.本人英语专八,依然解决不了这个问题,希望绝对高手给与绝对肯定有把握的回答.

选择B ,A多在口语中.B有虚拟也表猜测很重（实在不知道什么时候回来）,结合主句看B的感情更浓,选A感情语气过于平淡（似乎知道妈妈哥哥要回来）,B（实在不知道什么时候,一点概念也没有）

Sorry,I really don't know______ I don't know______ I really don't know______.A.what to buy her B.what should I sorry,I really don't know---------- i'm sorry ,I really don't know ( )the clock Sorry.I don't want that...I'm really Sorry I don't Dear I'm sorry I'm not intentional I really don't wanna hurt 根据首字母完成句子Son:I'm sorry.I really don't like country musicMoth I'm really sorry .I'm late .用Don't say so 回答对吗 I'am sorry .I really don't know ()the milk shake excuse me,but i don't think you can somke here.Really sorry.