问题补充：
I to help you with your homework, but I couldn’t spare any time. I a composition last night and I’ll finish it today.
A. wanted; wrote
B. had wanted; was writing
C. have wanted; wrote
D. wanted; have been writing
答案：
A. wanted; wrote
(答案→)B. had wanted; was writing
C. have wanted; wrote
D. wanted; have been writing
解析：考查时态。had wanted to do sth.意为“本想做某事”。答语中说今天完成，因此昨晚是正在写。用过去进行时。故选B。
