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    精英家教网 > 高中英语 > 题目详情
    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
    考查虚拟语气。结合上文，灯仍然亮着，可知是对过去的事情的推测。“must+have+done”表示对过去事情的肯定推测；“could+have+done”表示对过去事情的假设。结合题意可知下文是推测语气，故选D。
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