1.英语----（ ) you （ ) your book to the library?----Yes.I retur

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1.英语
----（ ) you （ ) your book to the library?
----Yes.I returned it yesterday.
A.Did.return B.Have,returned C.Do,return
答案说选B,我不肯定它正确,但请告诉我选它的原因
如果x和y是非零实数,使得|x|+y=3,|x|y+x的三次方=0,则x+y=多少?

1.答案说选B估计是根据回答对应的,回答说：I returned it yesterday就说我已经还了……当然这样理解并不太准确,不过你可以看看,老外问你有没有什么东西经常使用一个句型：Have you got……?所以选B是没有问题的,C虽然从语法上看没有什么错误不过不符合回答语句的时态吧,只能这么想了.正常说话C也是可以的.
2.从第二句话你就可以看出,|x|y+x=0,因此可以讨论两种情况,如果x大于0,则y=-1,此时x=4；如果x小于0,那么y=1,此时x=-2；从而x+y的值有两个,一个是3,另一个是-1.意思就是这样,这上面有的打不出来,具体过程还得你自己写啊.

Ann returned the book to the library yesterday.改为一般疑问句后retur _____you _____your book to the library?Yes ,I returned it ye Which is the book -------- you borrowed from the library yes 1.I (return )this book to the library soon I hear you ____ to the library.——Yes,I ____ to brrrow some b Have you finished the book ?I'd like to ____ to the library. You can borrow the book _____ your school library.（from,to,f Have you __ (return) the book to the library yet?Not yet.I _ “I want to read the book you borrowed it from the library th Have you returned the books to library?- A.Yes,I did B.NO,Id -does your sister remember to return the library book today? 求解答英语句子改错I should return the book back to the library at onc