—What were you doing when it started to rain?
—Well, I ________ my mom to clean our living room at that time.
—Well, I ________ my mom to clean our living room at that time.
| A．am helping | B．was helping | C．have helped | D．helped |
更新时间：2023-07-10 23:14:11
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【知识点】 表示过去某一时刻正在发生的动作解读
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