7.Your classmate from Britain would like to borrow your computer this weekend. Unfortunately, you need to use it at the same time. How would you refuse the request politely?
选项：

A: "Yes, but you need to give it back to me as soon as possible."
B:"I'd love to, but I'm afraid I've got a lot of things to type up as well."
C: "Well, why don't you borrow one from someone else?"
D: "Sorry, I cannot lend it to you."