—We're going for a picnic next Sunday and I'd like you to join us.—！I have to see my gran

问题补充：

—We e going for a picnic next Sunday, and Id 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

答案：

(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 thats 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。