问题
选择题
--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
答案
D
考查时态的用法。根据I overslept this morning 可知应用一般过去时。