made his teacher angry.
A. He was late
B. Whether he was late
C. What he was late
D. That he was late
网友回答
A. He was late
B. Whether he was late
C. What he was late
(答案→)D. That he was late
解析：考查主语从句。句意：他迟到让他的老师不高兴。 made his teacher angry.中缺少主语，且主语不缺成分，所以用That引导主从，且That不能省略。选D。