—Did they clean the house yesterday afternoon?
— . They cleaned it this morning.
A. No, they don’t
B. Yes, they did
C. No, they didn’t
D. Yes, they do
网友回答
A. No, they don’t
B. Yes, they did
(答案→)C. No, they didn’t
D. Yes, they do
解析：
这题考查一般过去时的一般疑问句的否定回答。肯定回答是：Yes，I did.否定回答是：No， I didn’t. 所以选C。