The reason he gave for being late was he forgot to set the alarm clock.
A. which; because
B. why; because
C. which; that
D. that; because
网友回答
A. which; because
B. why; because
(答案→)C. which; that
D. that; because
解析：考查定语从句和表语从句：第一空是定语从句，先行词是the reason，定语从句中gave缺少宾语，用that或which引导定语从句，第二空是表语从句：表示…的原因是…要用句型：(one)reason(for...)is that...句意：她迟到的原因是她忘记设定闹钟了。选C。