题目内容：

--We have already done our homework.--( ),and( ).A,So we have;so have you
B,So you have ;so have we
C,So have we;so you have
D.So have you ;so we have求详解,翻译

优质解答

B
SO+助/BE/情+主,表示 主语也.
SO+主助/BE/情 表示主确实.(是对主语的肯定)
So do I和So I do的区别和用法
一、So do I的用法该结构主要用来说明前面所说的情况也同样适用于后面的人或物,意为“……也一样”.该结构中的助动词 do 根据前文的情况也可换成 is, am, are, was, were, does, did, can, could 等.
如：He passed the exam, and so did I. =He passed the exam, and I passed the exam, too. =Both he and I passed the exam. =He and I both passed the exam. 他通过了考试,我也通过了考试./ 他和我都通过了考试.
又如：They went to the zoo yesterday. So did we. 他们昨天去了动物园,我们也去了.
但是如果前面所述情况为否定式,则用neither, nor引出倒装句(此时不能用so).
如：He couldn’t do it, and neither could she. 他做不了这事,她也做不了.
He never comes late. Nor do I. 他从不迟到,我也从不迟到.
二、So I do的用法该结构主要用于加强语气,其意为“的确如此、确实如此”,表示后者赞同前者的话或意见,只是进一步强调并重复前句所述的内容.前后句的主语指的是同一个人或物.该结构中的助动词 do 根据前文的情况也可换成 is, am, are, was, were, does, did, can, could 等.如：
—He has done a good job. 他干得不错.
—So he has. 他的确干得不错
—He will speak at the meeting tomorrow. 他明天将在会上发言.
—So he will. 确实如此.
—He went to see his friend yesterday.
他昨天去看朋友了.
—So he did. 的确如此.