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

試題分析：考查反意疑問(wèn)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。
考點(diǎn):考查反意問(wèn)句
點(diǎn)評(píng);表示猜測(cè)的情態(tài)動(dòng)詞的反意問(wèn)句，不應(yīng)該用情態(tài)動(dòng)詞做反意問(wèn)句，而是根據(jù)情態(tài)動(dòng)詞后面的動(dòng)詞來(lái)定。如情態(tài)動(dòng)詞+have done表示推測(cè)，如果句中有過(guò)去時(shí)間，就用過(guò)去時(shí)的反意問(wèn)句，如果沒(méi)有過(guò)去時(shí)間，就用現(xiàn)在完成時(shí)的反意問(wèn)句。
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