The light is still on. They ___ to turn it off when they left the room.
A．must forgetB．could have forgotten
C．may forgetD．must have forgotten
D
考查虛擬語氣。結(jié)合上文，燈仍然亮著，可知是對過去的事情的推測�！癿ust+have+done”表示對過去事情的肯定推測；“could+have+done”表示對過去事情的假設(shè)。結(jié)合題意可知下文是推測語氣，故選D。
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