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。
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