I had wanted to help you last night but I couldn't spare any time for I＿＿＿a composition w

问题补充：

I had wanted to help you last night but I couldn 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：句意：昨天晚上我本来想帮助你的，但是我腾不出时间，因为我正在写一篇今天早上要交的作文。因为是昨天晚上正在做…，用过去进行时，选B。