题目内容

He has to finish the experiment today. He must be in the lab, ______?
A．mustn’t heB．won’t heC．doesn’t heD．isn’t he
D

试题分析：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。
考点:考查反意问句
点评;表示猜测的情态动词的反意问句，不应该用情态动词做反意问句，而是根据情态动词后面的动词来定。如情态动词+have done表示推测，如果句中有过去时间，就用过去时的反意问句，如果没有过去时间，就用现在完成时的反意问句。
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