I had wanted to help you last night but I couldn’t spare any time for I a composition wh

问题补充：

I had wanted to help you last night but I couldn’t spare any time, for I a composition which I have to hand in this morning.

A. wrote

B. was writing

C. had written

D. have written

答案：

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。