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He is an hour late by now．He         last night．
A．must stay upB．should stay up
C．must have stayed up D．should have stayed up
C
考查虛擬語氣。句意：到現(xiàn)在他已經(jīng)遲了一個小時。他昨晚肯定熬夜了�！癿ust+have+done”表示對過去事情的肯定推測，譯成“一定做過某事”。故選C。
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