--I can’t understand why our boss is late.
--He _____the early bus.
A．could missB．may have missedC．can have missedD．might miss
B
考查虛擬語(yǔ)氣。句意：我不能理解我什么我們的老板遲到了�！赡苠e(cuò)過(guò)了早班車(chē)�！癿ay+have+done”表示對(duì)發(fā)生過(guò)的事情的推測(cè)，意思是“可能已經(jīng)”或“也許已經(jīng)”，故選B。
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