问题补充:
—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
答案:
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。