— Why not join us in the game Joe? — but I have to finish reading the book first.AYe

问题补充：

— Why not join us in the game, Joe?

—, but I have to finish reading the book first.

AYes, please

B. Let’s go

C. Not at all

D. I’d love to

答案：

A. Yes, please

B. Let’s go

C. Not at all

(答案→)D. I’d love to

解析：Why not do sth ？表示建议的，即为什么不做某事？对于对方建议回答，只能用ABD来回答，

而又根据后文but，故只能用答案D，来回答，表示乐意去，但是不得不做某事，故选D