I had wanted to help you last night but I couldn’t spare any time, for I a position which I have to hand in this morning.
A. wrote
B. was writing
C. had written
D. have written
网友回答
A. wrote
(答案→)B. was writing
C. had written
D. have written
解析：考查时态。根据句中的时间状语in this morning，故用过去进行时表示过去的将来，选B。