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

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：这是一组对话。上文，我们下周日去野餐，我想让你也加入我们。下文，真遗憾！我必须去看我的祖母，她已经病了两个星期了。What a pity真遗憾Good luck祝你好运That’s all right 不用谢Go ahead用吧，根据题意，故选A。