Adding a suitable tag: They must have stayed at home last night.

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问题 Adding a suitable tag:
They must have stayed at home last night.

选项

答案They must have stayed at home last night，didn’t／mustn’t they?

解析本题要求添加附加疑问句。本句中含有情态动词must和完成体的助动词have，因此其附加疑问句有两种形式。但如果句中含有明显的时间状语last night，要选用助动词did而不是have。

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现代英语语法

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