选出适当的句子补全对话。 Jack: 1.______ Lucy: I have been to the bookstore.Look,I bought a book. Jack: What is its name? Lucy: 'Journey to Mars'. 2.______ Jack: No, I hav en't read it before.Do you mind lending it to me? Lucy: 3.______ Jack: Thank you! Lucy: 4.______ A.Of course not. Here you are. B. Have you read this book befo re? C. Not at all. D. Where have you been?