I had meant to meet you at the airport this morning but I was too busy for I a report.
A. wrote
B. was writing
C. have written
D. had written
网友回答
A. wrote
(答案→)B. was writing
C. have written
D. had written
解析：B 考察动词时态。句意：我本打算今天早上去机场接你，但我太忙了，因为我正在写一份报告。根据句意和句中时态可知，此处表示今天早上本该接你的时候我正在写一份报告。即过去某一时刻或某一阶段正在进行孩子发生的动作，因此应该使用过去进行时。故B正确。