题目

 ---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   本题考查时态的用法。根据I overslept this morning 可知应用一般过去时。

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