--Jack's never worked hard at English, ?
-- , so he can't answer the question in English, I think.
A. is he; Yes, he is
B. is he; No, he isn't
C. has he; Yes, he has
D. has he; No, he hasn't
网友回答
A. is he; Yes, he is
B. is he; No, he isn't
C. has he; Yes, he has
(答案→)D. has he; No, he hasn't
解析：Jack’s此处为Jack has的缩写，因句中有never，故附加问句应用has；答句说明的是否定情况，故应用N0，he hasn’t。