The boy must be in the classroom，_________ he?
A.mustn'tB.needn'tC.hasn'tD.isn't在线课程D
当反意疑问句的陈述部分的must表“推测”意义时，后跟动词的一般式，简短问句的谓语可接“无must的一般现在时的反意疑问句”构成.答案为D.
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