2. 外语
  3. There are no lights on and no one answer the doorbell. They ______ be at home.

There are no lights on and no one answer the doorbell. They ______ be at home.

admin2009-09-15  49
问题 There are no lights on and no one answer 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 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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