问题补充：
---Have you finished reading The Twilight Saga?
---No, I my homework all day yesterday.
A. was doing
B. doing
C. did
D. have done
答案：
(答案→)A. was doing
B. doing
C. did
D. have done
解析：句意：你已经看完了《暮光之城》这本书了吗？没有，昨天一整天我都在做作业。句中有all day yesterday.昨天一整天都一直在做某事，用过去进行时表示一直在做某事，故选A
