--- He has to finish the experiment today. He must be in the lab, ? ---That s quite possible. A. mustn't he B. won't he C. doesn't he D. isn't he 题目和参考答案——青夏教育精英家教网—

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--- He has to finish the experiment today. He must be in the lab,____?

---That s quite possible.

A. mustn't he　　 B. won't he　　 C. doesn't he　　 D. isn't he

该题考查反意疑问句中尾句部分的助动词用法，must be结构中的中心词应为be，且He must be in the lab相当于I think he is in the lab，故其尾句部分为isn't he。

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