—I don’t suppose they could have finished their experiment, they?
— , they are still doing it in the lab.
A. could; Yes
B. didn’t; No
C. have; No
D. couldn’t; Yes
网友回答
A. could; Yes
B. didn’t; No
(答案→)C. have; No
D. couldn’t; Yes
解析：本题考查反义疑问句。句中主语为第一人称，且为否定，故从句为否定转移，故用have they.句意：——我认为他们不可能完成他们的实验，是吗？——是的，他们仍然在实验室做实验。