.--- 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
該題考查反意疑問句中尾句部分的助動詞用法，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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