—Cathy, did you attend the lecture given by Mr Black last night?—No. I a report at the of

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(答案→)A. was writing
B. wrote
C. had written
D. have been writing
解析：考查时态：句意：--Cathy，你参加昨晚布莱克先生做的讲座的了吗？--没有，我在办公室写报告。根据句意，Cathy在办公室写报告的时间就是昨晚布莱克先生做讲座的时候，所以用过去进行时，选A。