过去进行时 — 英语填空题
题目
用 was 或 were 加动词的 -ing 形式填空，描述昨天下午大家正在做的事：1. I ___ ___ (do) my homework at four yesterday afternoon. 2. They ___ ___ (play) football in the park. 3. She ___ ___ (read) a book in the library. 4. We ___ ___ (walk) home when the rain started.