问题

Thanks for listening to my problem and giving me your advice, Amy.— _____________. That’s what friends are for.
A:if I can keep this book for 5 days
B:can I keep this book for 5 days
C:how long can I keep this book
D:that I can keep this book for 5 days;
B:can I keep this book for 5 days
C:how long can I keep this book
D:that I can keep this book for 5 days;
正确答案是: