The door is open but nobody is in. Susan______have forgotten to lock the door.

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问题 The door is open but nobody is in. Susan______have forgotten to lock the door.

选项 A、should
B、must
C、would
D、could

答案B

解析句意：门开着，却没人。苏珊肯定是忘记关门了.本题考查的是情态动词的用法。must have+过去分词表示对过去事实的肯定猜测，符合题意。故B正确。

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