我女儿早上一直在做家庭作业。
她们俩都从未写过这么长的报告，因此她们一直在做这个难写的作业。
Neither of them has written such a long essay before, so they have been working hard on this difficult assignment.
做完我给他打电话时，他一直在做作业，已有好几个小时了。
He had been doing his homework for hours when I called him yesterday evening.
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