We don’t believe the reason he gave for his being absent from school.
A. that
B. why
C. because
D. for which
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(答案→)A. that
B. why
C. because
D. for which
解析：考查定语从句。本题定语从句的关键是分析句子结构，后面定语从句动词give后面缺少了宾语，故使用关系动词that指代先行词作为give的宾语。本题容易错选B项，why是关系副词，当定语从句中句子很完整，才需要使用关系副词。句意：我们不相信他给出的上学迟到的理由。故A正确。