----- You seem in low spirits. Anything wrong?
----- I in the important exam. I let my parents down.
A. fail
B. failed
C. has failed
D. had failed
网友回答
A. fail
(答案→)B. failed
C. has failed
D. had failed
解析：考查时态。句意：—你似乎清醒低沉。出来什么事情？—我在考试里没有考及格。我让我的父母失望。根据句意说明我考试不及格是过去发生的事情，故使用一般过去时。故B正确。