---Why not take a short rest at home today?---.A. You’re friendly.B. Have a good time.C. Y

问题补充：

---Why not take a short rest at home today?

---.

A. You’re friendly.

B. Have a good time.

C. You’re welcome.

D. That’s a good idea.

答案：

A. You’re friendly.

B. Have a good time.

C. You’re welcome.

(答案→)D. That’s a good idea.

解析：why not+动词原形意思是问什么不怎样，表示的是一种建议。其肯定性回答常用that’s a good idea。