--- 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

D


解析:

該題考查反意疑問句中尾句部分的助動(dòng)詞用法，must be結(jié)構(gòu)中的中心詞應(yīng)為be，且He must be in the lab相當(dāng)于I think he is in the lab，故其尾句部分為isn't he。

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