It disappointed his parents he had failed to pass the exam for third time.
A. because ; a
B. that; a
C. when; the
D. that; the
网友回答
A. because ; a
(答案→)B. that; a
C. when; the
D. that; the
解析： 句意：让他父母失望的是他考试又一次失败了。It是形式主语，后面真正的主语不缺成分，所以用that引导；a third time. 强调又一次，再一次，而不是强调第三次。选B。