问题补充：
The examination results in the speech of our headmaster delighted all of us.
A. refer to
B. referring to
C. was referred to
D. referred to
答案：
A. refer to
B. referring to
C. was referred to
(答案→)D. referred to
解析：本句主语为the examination results,谓语为delighted,意那场考试结果让我们大家都十分高兴。而refer to in the speech of our headmaster“在校长讲话中提到的” 修饰the examination results(考试结果)，作定语，考试结果是refer to 的逻辑主语，之间是被动的关系，故填referred to,,
