-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：考查交际用语：A. What a pity真遗憾B. Good luck祝好运C. That’s all right没关系D. Go ahead请便，句意：--我们下个星期天要去野餐。--真遗憾，我得去看奶奶，她病了两个星期了。选A。