The classroom is empty.They must have gone to the sports ground,_________?A don't they B didn't they C haven't they D hadn't they

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The classroom is empty.They must have gone to the sports ground,_________?A don't they B didn't they C haven't they D hadn't they
The classroom is empty.They must have gone to the sports ground,_________?
A don't they B didn't they C haven't they D hadn't they

The classroom is empty.They must have gone to the sports ground,_________?A don't they B didn't they C haven't they D hadn't they
A

C haven't they

选A

这道题must表推测，肯定选C
陈述句中的must表示一种推测时，含义为“一定、准是”时，附加谓语不用must和need，而是在意义上和陈述句中谓语动词的时态保持一致。通常有四种情况：
1． 陈述部分有表示过去的时间状语，附加谓语中的动词就用一般过去时。
She must have heard the good news just now, didn’t she?

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这道题must表推测，肯定选C
陈述句中的must表示一种推测时，含义为“一定、准是”时，附加谓语不用must和need，而是在意义上和陈述句中谓语动词的时态保持一致。通常有四种情况：
1． 陈述部分有表示过去的时间状语，附加谓语中的动词就用一般过去时。
She must have heard the good news just now, didn’t she?
想必她刚才听到了那个好消息，是吗？ (一般过去时)
2．句中陈述部分没有表示过去的时间状语，这时附加谓语中的动词就用
现在完成时。
You must have studied English for many years, haven’t you?
你一定学了多年的英语，不是吗？ (现在完成时)
3．陈述部分的动词表示经常性的动作或状态，附加谓语部分的动词就用
一般现在时。
He must be from the south, isn’t he?
他一定是南方人，对吗？ (一般现在时)
4．陈述句部分的谓语动词为现在进行时，也需要时态上的呼应。
I think they must be watching this exciting football match now, aren’t they?
想必他们正在观看这场精彩的足球赛。 (现在进行时)

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选C，现在完成时~

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