过去进行时的构成与用法 — 英语词汇题
题目
用所给动词的适当形式填空。1. While it ______ (rain) heavily outside, Lucy ______ (do) her homework in the classroom. 2. —What ______ you ______ (do) at eight yesterday evening? —I ______ (help) my mother cook dinner. 3. When the storm ______ (come), many people ______ (wait) for the bus at the stop.