问题补充：
─ Would you like to go camping with us this weekend? ─
A. I’m afraid so.
B. I’m glad to hear that.
C. Yes, I’d love.
D. A great idea!
答案：
A. I’m afraid so.
(答案→)B. I’m glad to hear that.
C. Yes, I’d love.
D. A great idea!
解析：四个选项含义分别是我担心如此、我很高兴听到那个消息、是的我愿意去，和一个好主意。其中A不符语义，C语法有误，联系上文只有B选项最符合题意。
