Let,s return the book to the library.A shall we B will you C won,t we D don,t we 选什么WHY

选A,
因为前面的陈述句是Let us, 所以后面的反义疑问句就是 Shall we?什么情况用BCD ?We have the same hobby, don't we? 前面是肯定句，我们怎样怎样。Open the door, will you? 前面的句子一般是祈使句，请你，麻烦你做某事won't we 不常见再详细点么当陈述部分是祈使句时，疑问句要根据语气来表达，分三种情况： 　　1）一般情况下用will you 或 won't you。 　　e.g. Give me a hand,will you? 　　Leave all the things as they are,won't you? 　　2)以Let's开头的祈使句，疑问句用shall we;以Let us或Let me开头的祈使句，问句用will you。 　e.g. Let's go out for a walk, shall we? 　　Let us go out for a walk, will you? 　　Let me help you,will you? 　　3)当陈述句是否定的祈使句时，问句可用will you 或 can you 。 　　e.g. Don't make much noise,will/can you?