There are no lights on and no one answers the doorbell. They______be at home.

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问题 There are no lights on and no one answers the doorbell. They______be at home.

选项 A、must not
B、will not
C、should not
D、can not

答案D

解析本题考查情态动词的用法。选项A表示“禁止，不允许”，can用在否定句或疑问句中表示推测，故选D。

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