礼貌拒绝邀请的表达 — 英语选择题
题目
Tom invites Lucy to his birthday party. Lucy would like to go, but she has to visit her grandma that day. Which is the most polite way for Lucy to refuse the invitation?
A. No, I don't want to go.
B. Sorry, I can't. I have to visit my grandma.
C. I'm not free.
D. Maybe next time.