--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
D
Jack’s此處為Jack has的縮寫，因句中有never，故附加問句應用has；答句說明的是否定情況，故應用N0，he hasn’t。
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