They must have stayed at home last night,______?

admin2012-06-19  18

问题 They must have stayed at home last night,______?

选项 A、mustn’t they
B、haven’t they
C、aren’t they
D、didn’t they

答案D

解析 当陈述部分为must表示“一定,想必”等推测意义时,反意疑问句不用must,而要根据陈述部分的不定式结构采用相应的系动词或助动词形式。
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