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--- He has to finish the experiment today. He must be in the lab,____?
---That s quite possible.
A.mustn't heB.won't heC.doesn't heD.isn't he
D
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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