单选题 His teacher deemed his absence from class______; she had observed him playing vigorously with his friends throughout the day, without the slightest indication of illness.
【正确答案】 A
【答案解析】解析：从句子前后的逻辑关系可以推断出该生大概以生病为由没有上课，而老师却发现他并没有生病，说明该生说了谎，因此说该学生的行为是“不可原谅的”比较合理，选项A为正确答案。其余选项B“全面的，综合的”，C“正确的”和D“秘密的，偷偷摸摸的”都无法准确地说明该学生说谎这一行为的性质，因此不正确。