Question

【题目】They had to walk here, ___ they?

A. mustn't B. did C. didn't D. hadn't

Answer 1

【答案】C

【解析】句意：他们不得不步行去那里，是吗？mustn't禁止，不应该；这里是反义疑问句，陈述部分有have to +v. (had to + v.)，疑问部分常用don't +主语（didn't +主语）。如：We have to get there at eight tomorrow, don't we?因为前面是had to，所以后半部分用didn't，故选C。