He used to have nothing for breakfast ?A. usedn’t heB. didn’t heC. did heD. must he

问题补充：

He used to have nothing for breakfast,?

A. usedn’t he

B. didn’t he

C. did he

D. must he

答案：

A. usedn’t he

B. didn’t he

(答案→)C. did he

D. must he

解析：used to的反问形式用“usedn’t.../didn’t...?”，陈述部分有nothing，所以反问形式用肯定形式。