【题目】--- Why didn’t you ring me up when Sue arrived?
---sorry, I ______ my essay that was to be handed in by noon.
A. had written B. wrote
C. have been writing D. was writing
在线课程【答案】D
【解析】试题分析：根据语境可知当时我正在写论文，强调过去的某个时刻正在进行的动作，用过去进行时，A项为过去完成时，B项为一般过去时，C项为现在完成进行时，故选D。