--- My son is _____ to be seen. Where has he gone? --- I think he _____ in the buildingA.nowhere; must be hidingB.nowhere; must be hidden himselfC.anywhere; hidesD.everywhere; hides himself
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A解析试题分析：考查情态动词表示推测的区别。根据后半句“Where has he gone?”可知，说话者不知道其儿子在哪里，故第一空填在哪里也不见的单词“nowhere”；另一个人说：我认为他一定正在这栋建筑里，且hide与他之间应为主动关系；故A正确。考点：考查情态动词表示推测的区别。