昨天爸爸回家的时候，我正在做家庭作业。
I was doing my homework when my father came back home yesterday.
昨天晚上我本来要参加你的生日晚会的，但因做家庭作业而没有去成。
I would like to have gone to your birthday party last night, but I had to do homework.
昨天我完成了我的家庭作业。
昨天晚上妈妈回家的时候，我正在做家庭作业。
I was doing my homework when my mother came back home yesterday evening.
昨天我花了不到两小时完成我的家庭作业。
It took me less than two hours to finish my homework yesterday.
昨天我花了不到两小时完成我的家庭作业。
It took me less than two hours to finish my homework yesterday.
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