—We're going for a picnic next Sunday, and I'd like you to join us.
— ！I have to see my grandmother. She has been
ill for two weeks.
A. What a pity
B. Good luck
C. That’s all right
D. Go ahead
网友回答
(答案→)A. What a pity
B. Good luck
C. That’s all right
D. Go ahead
解析：考查交际用语，what a pity!真可惜，真遗憾 good luck 祝你好运 that's all right.没关系，不用谢 go ahead 好的，
根据I have to see my grandmother. She has been ill for two weeks可知，他不能去，所以只能说真遗憾。