-- Let’s go for a walk in the garden. ----- but I need to do the wash-up.A. No thank

问题补充：

---- Let’s go for a walk in the garden.

-----, but I need to do the wash-up.

A. No, thank you

B. That’s right

C. Good idea

D. Not at all

答案：

A. No, thank you

B. That’s right

(答案→)C. Good idea

D. Not at all

解析：本题上句表示建议，对于建议觉得可行，可用好主意来回答，good idea表示此意，故本题选C。