--Do you want a lift home?
---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock .
A. doesn’t go off
B. won’t gone
C. wasn’t going off
D. didn’t go on
网友回答
A. doesn’t go off
B. won’t gone
C. wasn’t going off
(答案→)D. didn’t go on
解析:考查时态的用法。根据I overslept this morning 可知应用一般过去时。