公共英语二级
单选题There are no lights on and no one answer the doorbell．They＿＿＿be at home．
参考答案：D进入在线模考
本题考查情态动词的用法。选项A表示“禁止，不允许”，call用在否定句或疑问句中表示推测，故选D。
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