－How about having a picnic with me?－I’d love to I’m afraid I have no time. A. so B. and

问题补充：

－How about having a picnic with me?

－I’d love to, I’m afraid I have no time.

A. so B. and C. but

答案：

解析：连词考查。so表示因果关系；and表示顺承关系；but表示转折关系。根据答语句意”我想参加野营”和“恐怕我没有时间”可知，两者为转折关系，故用but。