I __the book to the library.When _you_ it?第一句为什么用现在完成时,不用一般过

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I __the book to the library.When _you_ it?第一句为什么用现在完成时,不用一般过去时?
3.I_____the book to the library.When ______ you_____ it?
A.have returned; did return B.have returned; have returned C.returned; did return
这个为什么选A?如果选C,就是说我过去做过还书这一动作.对现在没影响.书不一定在哪.那对方问我什么时候还的也可以啊.为什么不能选C啊?晕死,

A 现在完成时态表示过去发生的动作对现在造成的影响或结果.现在结果是书不在我这里了.
再问：谢谢！那么为什么不能选C，如果选C变成什么意思啦，求解？
再答：选C 的话没有具体时间，一般用过去时要有上下文提示，或跟具体的过去时间，这里没有，考虑用现在完成时态。
再问：谢谢老师！还有： 9. My dictionary ___, I have looked for it everywhere but still___ it. 　A. has lost, don't find B. is missing, don't find C. has lost, haven't found D. is missing, haven't found. 这个第一空为什么要用现在进行时，不用现在完成时？
再答：表示现在的状态，be missing 不见了的状态，这一动作并没有完成，所以不用完成时态。希望能帮到你。有疑惑我们再探讨，OK?

I __the book to the library.When _you_ it?第一句为什么用现在完成时,不用一般过 When must she go to the library?句中为什么不用goes? i returned the book to the library的同意句 remember（）the book to the library when you finish （）it 说明原因 when will you return the book to the library?改为同义句 please ---the book ---the library when you finish it It is time for you to return the book to the library 同义句 I'll return the book to the library as soon as I ____ it. There was a time when I hated to go to school 句中为什么用a 而不用the “I want to read the book you borrowed it from the library th I____the book to the library.---When ___ you___it? _____you _____your book to the library?Yes ,I returned it ye