问题补充：
— I don’t think he is studying English in his room now.
— Oh! ?
A. Does he
B. Doesn’t he
C. Is he
D. Isn’t he
答案：
A. Does he
B. Doesn’t he
C. Is he
(答案→)D. Isn’t he
解析：注意这并不是反意问句，而是答语。这种答语对前者说话内容表示强烈的惊奇、恐慌、认同、称赞、夸耀等感情色彩，但所用的主谓语仍根据前句中的从句来确定，故选D。
